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Hearing aid,ok for old people and hearing loss people,Sound are decoded and converted into vibration on bone not eardrum!directly received by cochlea----bypass the eardrum .No electric-Magnetic wave

It's perfectly used in the water or special work environment,such as underwater training spot or swimming center and surfing on the water.with the little gadget the couch do not have to shout at the trainee all the time,Its absolutely easy to use,just speak to your trainee or partners with the nomal voice-volume to the boxes-- Applications: swimming, underwater exploration, underwater ballet, deaf and dumb school sailing

.Receiver sensitivity: -113dBm
. Input sensitivity: < 200mv
.Signal to noise ratio: > 82dB
. Distortion rate: less than 0.7
. Frequency response: 60Hz to 20kHz
. Loudspeaker: bone conduction
. Power supply voltage: 3.7V DC
. 10 meters under water work . Suitable for entertainment enjoyment in life under the water
. Through a wireless host may lead various formats music
. Under the water by means of a bone conduction, the closed state change in the water, children can get refreshing and fatigue resistance
. In bad listening environment he can improve the security of command

Remark:headset used with walkie talkie.1 wakie talkie can speake to 10pcs headset at most, purchase 1:1 to 1:10