| brand name:comfree | model number:mmd-0552 | style:headband |
| communication:wireless | connectors:3.5mm | use:portable media player |
| place of origin:guangdong china (mainland) | wireless:microphone | connectivity tecnique:2.4ghz |
| jack:usb |
| packaging detail: | clamshell package |
| delivery detail | 15 daysafter the receipt of 30% deposit payment |
wireless headphone:
1.2.4ghz wireless
2.double way transmit-receive device
wireless headphone main features:
a. profile
mmd-0552 is a 2.4ghz wireless double way transmit-receive device; usb double transmits music to wireless headphone,the wireless headphone has a microphone for chatting; with a external audio input port, can use as a common headphone; support windows me/2000/xp/nt or higher edition; headphone has built-in li-ion battery, can repeated use
b. model: mmd-0552
c. product drawing
d. button description:
1. headphone:
:on/off/marching:
v-:volume down
v+:volume up
e. specification:
quiescent current (headphone): under 1ua
working current (headphone): under 70ma
quiescent current (transmitter): under 80ma
working voltage (transmitter):5v
transmit power: +2dbm
level of sensitivity: -66dbm
working voltage (headphone): 3.7- 4.2v
charging current (headphone): under 200m(led shows red)
output power (headphone): 15mw*2
battery capability (headphone): 320mah
charging time (headphone): 2.5hours
working hours (headphone): 4-6hours
battery cycle life (headphone): ≥300 times
effective distance: outdoor ≥10m
channel separation: 1k hz, one channel is silent, the other channel-3db fs 67db
total harmonic distortion:
1k hz, -1db fs, volume setting = 0db -68 db
1k hz, -3db fs, volume setting = 0db -70 db
1k hz, -13db fs, volume setting = 0db -76 db
voice mode:
stereo audio + mono voice
audio: 84db snr,48 khz sampling rate
voice: 64db snr, 16 khz sampling rate
audio mode: stereo audio db snr, 48 khz sampling rate
f. user guide
button function:
1.plug usb-hid(dongle)to pc usb female port,pc will detect and install it automatically
2.(headphone)a short push “ ” to power on (about 1 second),a long push“ ”to power off (about 3 seconds);green lighting shows playing and microphone working, then you can chat
3.(headphone)push“v+”+1 sound,a long push will progressively increase
4.(headphone)push“v-”-1 sound,a long push will progressively decrease
5.a long push“ ”to power off (about 3 seconds);
6.if not play or paused more than 60 second,it will shutdown automatically
7.headphone charging by usb:use usb wire to connect pc, then red led out shows charging with constant current;red led shows power full
headphone/usb-hid led(green light):
1.green means working normally
2.1 times flash in 1 second:usb-hid does not connect the headphone(you need to match the code).
3.quick flashing:code matching
code matching by headphone and usb-hid(dongle):
1. plug usb-hid to pc,push usb-hid code match button 5 seconds until green light quick flash;
2. push " "5 seconds on headphone,green light quick flash
3. you will see both green light on dongle and headphone flash quickly, when the green light normally on ,it matched the cord
g. input/output audio source:
1.input audio source:
1.turn off the headphone
2.plug od3.5 to od3.5 audio wire to “audio in”od3.5 female port
3.connect the other part with mp3/ipod output port as a earphone
2. output audio source:
a. connect d3.5 to od3.5audio wire with “audio in”od3.5female audio port
b. connect the other part with amplifier or earphone audio source input port
h. reliable test
standard testing conditions:
temperature: 5-35°c, humid:45-85%, air pressure: 860-1060mbar. relative temperature: 20±2°c, relative humid: 60-70%, under the air pressure: 860-1060mbar
high temperature test it is normal condition after exposing at 50°c for 60 hours.
low temperature test it is normal condition after exposing at -30°c for 60 hours
humidity it is normal condition after exposing at 30°c, 95% for 60 hours
i. note
1.do not use it in very cold/hot/ash rich/moist/dry conditions(applicable temp:-25°cto -50°c)
2.do not drop it
3.please keep the battery semi-saturation(half-charged) if you won`t use it in a long term, and fully charge it 2-3 month later, then keep it semi-saturation again; store the battery away from sunlight in a cool place, your battery will have a longer life
please note:
(1)system shutdown automatically,please recharge it
(2)no reaction when push the button, please recharge it
(3)the battery will be charged whether power on or off once connected with pc
(4)do not open the body;
(5)we may update the function
j. accessories
1.od3.5 to od3.5black 3 core audio wire
2.usb a to mini usb connector
k.product photo
| Buyer | Product Information | Price | Order Date |
|---|---|---|---|
fernandoreyesnieves
|
Wireless Headphone/headset |
US$2,400.00
|
11 January 2026 |
Mostafa Al-shammary
|
Wireless Headphone/headset |
US$2,400.00
|
18 January 2026 |
paul
|
Wireless Headphone/headset |
US$2,400.00
|
18 May 2026 |
Husni Ameer
|
Wireless Headphone/headset |
US$2,400.00
|
05 April 2026 |
shekhar ratnakara
|
Wireless Headphone/headset |
US$2,400.00
|
24 March 2026 |
| Buyer | Feedback | reviews text |
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