CS10 Cordless Telephone Headset System Key Features: 150 foot mobile range from base Adjustable volume control Channel change Mute, talk and charge indicator lights Compatible with Plantronics Handset Lifter Accessory(HL1) 2.5 mm to Quick Disconnect cable that supports standard H-series headsets. Delivers... Mobility. Hands-free mobile design has a range of up to 150 feet from the base unit. Versatility. Duoset™ headset is adjustable for over-the-head stability or over-the-ear convenience, with new conformable earhook. Great Sound. Adjustable tone control and transmit and receive volume control allow for superior sound. Extended Use. Six-hour continuous talk time on rechargable battery Easy Installation. Connects to single or multi-line corded telephones. Remote Answering. Remote call answering with optional Plantronics Handset Lifter Accessory.