The Sennheiser HDR 120 RF wireless headphones are designed for use with Sennheiser's RS 115, RS 117, RS 118, RS 119, RS 119-II, RS 120, and RS 120-II wireless headphone systems so a friend or partner can also listen along to the television with you. These headphones feature extended low frequency reproduction, a supra-aural, open-back design, and include two NiMH rechargeable batteries for up to 20 hours of listening time. Please note that these headphones will not function without a compatible base station.
Open-back, supra-aural stereo wireless RF headphones with extended bass reproduction for Hi-Fi or television monitoring
Three selectable RF channels in two separate UHF groups with receiving range of up to 300', reception through walls and ceilings
Very lightweight headphones with comfortable padded ear cushions and headband
Dual NiMH "AAA" rechargeable battery operation with 20-hour battery life