The transmit power for: 20 MW 1, launch host 1 1, this product for the reception of the supporting the host, launch distance to: 120 m 2, power adapter a 2, through the wireless host of LINE-IN various formats music can bring joy. Modulation mode: FM 3, product instruction 1 a 3, in the water through the bone conduction way, make the person is in the closed position underwater change, heavy son can play a refreshing, resist fatigue distortion rate: 0.7% or 4, product certificate 1 of 4. In the hearing the bad environment he can improve command safety frequency response: 60 Hz-20 KHz 5, it is the underwater coach's right-hand man, solved the past shout break throat things. The normal working hours for: 8 hours 6, application field: swimming, underwater exploration, underwater ballet, sailing deaf school noisy environment ? power supply