Headband headphones wireless headphones range 100m includes 2x nimh rechargeable aaa batteries adaptor 63mm adaptor rca to mini headphone 35mm series sennheiser rs line type of fitting on ear transmission mode cordless impedance 24 ohm frequency response 22 19500 hz jacks 35 mm 63 mm colour black weight 230 g included in delivery battery 63 mm adaptor power supply