Output power: left track right sound channel 1.5 W * 2 (4 Ω) 1, water sports MP3 1 1, this product clever design, use special bone conduction technology change entertainment to enjoy life. Input sensitivity: more than 400 mV 4, power adapter 1 2, built-in player with 2 gb memory memory can be play MP3, WMA music format. SNR: frequency 82 dB 5, product specifications