Rca 900MHZ Wireless Headphones Induction Charging 150 Range 40mm driversTransmits up to 150' through walls and floors Lightweight with self-adjusting headband and velvet earpadsAuto-tuning and PLL technology to lock in best frequency3-channel transmission to reduce frequency interferenceTransmitter doubles as charging stand Includes rechargeable 600mAh NiMH batteries