Compatible With Sennheiser RS110, RS120, RS130, RS160, RS170, RS 180, RS-195, RS-220, PXC 250-II, PXC 350, PXC 450, HDR 170. - HQRP TWO Rechargeable Batteries; - Battery Voltage: 1.2V; Capacity: 900 mAh; Ni-Mh; - Rechargeable 1000 Times; - No memory effect and no capacity loss when recharging; - Compatible with Sennheiser RS110, RS120, RS130, RS160, RS170, RS 180, RS-195, PXC 250-II, PXC 350, PXC 450, HDR 170;