Compatible for video, multimedia, TV and CDs. Integrated rechargeable battery charging Circuit. Its powerful: full in the low and brilliant in the high. Small transmitter, integrated antenna and maximum power. Autonomy: 10 hours depending on use. Ergonomic and hygienic textile toe. Loads and washes easily. Rotary volume regulator and frequency tuning. Maximum sound pressure : 115 dB. Range: about 100 meters. Distortion rate: < 1%. Batteries : 2 x rechargeable battery 1.2 V AAA. Gray and black.