2.4GHz Wireless Headset w/ SOUNDTUBE Headset - GN Netcom 2.4GHz wireless convertible over-the-ear/head headset - 300ft Range - Up to 8 hours talk time per battery charge - Includes soundtubestyle microphone - Soundtube works best in less noisy environments - Multi-unit conferencing capability (up to four units on one call) - Headset converts from over-the-ear to monaural over-the-head - Secure communication with multi-layered security system and 64-bit encryption - 1 Year manufacturer's warran