1.USB storage with 2.0 2.Supports MP3 and WMA 3.FM function 4.For Swimming trainning 5OEM

Training swimming gadget                                                                      

Its perfectly used in the water or special work environment,such as underwater training sporter swimming center and surfing-on the water.with the little gadget the couch don't 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.

Function introduction: Suitable for entertainment enjoyment in life under the waterThrough a wireless host may lead various formats musicUnder the water by means of a bone conduction, the closed state change in the water, children can get refreshing and fatigue resistanceIn bad listening environment he can improve the security of commandIt is underwater coaching assistants, solve past call things that break the throatApplications: swimming, underwater exploration, underwater ballet, deaf and dumb school sailingParameters: Receiver sensitivity: -113dBmInput sensitivity: ≤ 200mvSignal to noise ratio: ≥ 82dBDistortion rate: less than 0.7Frequency response: 60Hz to 20kHzLoudspeaker: bone conductionPower supply voltage: 3.7V DC10 meters under water work

Children Swimming Training waterproof earphone with volume control