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Syllable D900 Manual

Made by: Syllable
Type: Manual
Category: Headsets
Pages: 7
Size: 0.84 MB


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Preface / P1 

About Syllable / P1 

Wireless Bluetooth Headset Operation / P2

Product Maintenance / P8

Trouble Removal / P8

Product List / P9

Main Characteristics and Parameters / P9



Black-Bean Bluetooth Headset 

Note / P7


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Thank you for choosing 


yllable D900 

. You will 

Bluetooth headset 

enjoy high-quality sound and convenient hands-free calling! Please 

keep this manual to get indication on operation 





Charging thimble  2


Charging socket  3 Power supply indicator



Charging tactile disc






4 Entity button




鈥淪yllable鈥 is a high quality headphone brand created by Shenzhen 

Kaijuyuan Technology Co.,Ltd. durability, fashion style, and 

exceptional sound

鈥淪yllable鈥 means syllable which is the basic element in music. We 

want to use our technology and craft to make a high quality headphone 

which can let you feel each nice syllable of music

Wireless Bluetooth Headset Operation

Diagram for D900 Bluetooth Headset


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Wireless Bluetooth Headset Operation



1. Power on

Press and hold the entity button for 2 seconds when power is off

2. Power


Press and hold the entity button for 6-7 seconds when the power

is on, then the red LED will be flashing for one second and a 

notification sound will be heard accordingly

Wireless Bluetooth Headset Operation

3. Connect earphone to cellphone                   

Enter connection mode of cellphone: when the power is off or the 

blue LED is flashing, press and hold one of the entity buttons 

which in L/R earphones for 3-4 seconds, then both red and blue 

LEDs flash alternately and fast. Use the Bluetooth function in your 

cellphone to search for 鈥淒900鈥 and click connection; input the code 

鈥0000鈥 if needed


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Wireless Bluetooth Headset Operation

Wireless Bluetooth Headset Operation

4. Connect L/R earphones

Connection mode for L/R earphones: when you complete the connection of 
single side earphone, press and hold the entity button for 1-2 seconds, both 
red and blue LEDs are on at the same time, then red and blue LEDs flash 
alternately and slowly after releasing, or release the entity button after a beep 
sound to be heard, at this time enter pairing mode for L/R earphones.  The 
other earphone does not need to connect cellphone, just press and hold the 
entity button for 1-2 seconds when the power is on, until that both red and 
blue LEDs are on at the same time, then release the entity button and both 
red and blue LEDs will be flashing alternately and slowly, or release the entity 
button after a beep sound to be heard, two earphones flashing red and blue 
lights alternately and slowly (ready for pairing), and searching for the link 
automatically. (For the paired previously earphone cellphone, press and hold 
Power On button for 2 seconds to automatically connect)



5. Call function

when calling, the button of earphone which firstly connected to 

cellphone is available and only the earphone can hear the voice 
when calling.


Dial:  when earphone is connected to cellphone, press the entity  
button twice to re-dial the latest phone number.  

Incoming call:  when there is an incoming call, press the entity 
button to answer the call, press and hold to refuse it.

End call:  press the entity button to end call when calling.


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a. Please keep this product dry and use clean soft cloth to clean the surface of the Bluetooth headset. 
b. Please use this product when permitting, e.g. on the airplane that allows to use wireless Bluetooth 
    transmission, etc. 
c. Never place the Bluetooth headset in dust, high temperature or especially low temperature areas. 
d. Never tear down the Bluetooth headset by yourself, because non-professional handling will do damage 
    to the Bluetooth headset.
e. Never perform destroyed operation to the Bluetooth headset, e.g. beating and crashing, etc. 
f. Never produce short circuit between the Bluetooth headset and charging connector of power charging 
   box, because this operation can damage the circuit and battery


g. Please use original accessories. Any accident caused by other accessories is not in the purview of 

Wireless Bluetooth Headset Operation

Product Maintenance

Phenomenon                      Reason                       


Starting-up failure


low battery


charge for about 3 hours

No sound after pairing


wrong pairing



Red light shines during 
phone talking


low battery warning


please charge immediately

No indicator during 


no voltage output from 
AC adaptor


Shut down automatically   


low battery 


charge for about 3 hours



volume is too high or environment
is too noisy 


adjust volume or change environment

Noise during phone calls


environment disturbance or 
headphone Is too far away 
from device

change environment or shorten the
distance between headphone and device

Low volume of the caller 


wrong wear of headphone


adjust headphone position

check if AC adaptor is well plugged       
in or if power switch is on


Trouble Removal

5. Playing music 

(it has the same function with the entity buttons of L/R earphones, 
and the output is stereos.)


Playing music: when earphone is connected to cellphone, press the 
entity button to play music.

 Pause: when playing the music, press the entity button to pause.

6. Recharging earphone

Charging: the new earphone has a dielectric film, release it and put 
transparent cover before charging


1. When entering connect mode of L/R earphones, both red and blue LEDs 
   flash alternately and slowly, and delete all the connection record of all 
   L/R earphones.
2. When you playing the music, blue LED light flashes slowly.
3. The red light is keeping on when the battery is low.
4. Put the earphone into the battery compartment, the red LED indicates 
   recharging, the blue LED indicates full charging.



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Wireless Bluetooth 
Model: D900



Warranty card 

Instruction Book



8mm copper-ring loudspeaker




Bluetooth version



Power level


CLASS II DSP phase compensation

Working voltage 




Sensitivity of microphone





frequency brand 




Bluetooth distance 




Audio transmission 



A2DP/AVRCP high quality stereo

Power supply indicator 


Red light lightens when charging, and blue
light lightens if the headset is fully charged.

USB charging cable 

Product List

Main Characteristics and Parameters

1. True wireless abilities: Syllable realizes 鈥渕ovement and wireless control鈥, and everyone can share 
    music within 10m. 
2. Limitless charging: Matched storage box is provided with built-in Lithium electric device that can 
    provide charging support more than six times to earplug. 
3. Sing headset or both headsets: Each earplug is provided with a complete set of circuit system so that 
    you can use a singe one or both two. 
4. Active noise reduction: Adopt active noise reduction circuit design in combination with in-ear earplug 
    design to effectively filter outside noises. 
5. Comfortable and convenient: Earplug and ear-hook are made of food-grade silica gel material in 
    combination with the design to avoid falling off, which makes you comfortable and relieved. 
6. One button to answer the phone: One button to answer the phone with multiple functions keeps you 
    away from tedious life, convenient and fast
7. Color in riotous profusion: Heyddo D900 Bluetooth headset is possessed of multiple color combination, 
    satisfying your 鈥渃olorful鈥 needs. 

Main Characteristics and Parameters


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FCC Caution. 

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful 
interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. 
Any  Changes  or  modifications  not  expressly  approved  by  the  party  responsible  for  compliance  could  void  the  user's  authority  to  operate  the 


 This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. 

These  limits  are  designed  to  provide  reasonable  protection  against  harmful  interference  in  a  residential  installation.  This  equipment  generates 
uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to 
radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause 
harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try 
to correct the interference by one or more of the following measures: 
-Reorient or relocate the receiving antenna. 
-Increase the separation between the equipment and receiver. 
-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. 
-Consult the dealer or an experienced radio/TV technician for help.