Adapts to both over-the-head and over-the-ear styles. Fully rechargeable battery is easy to replace and provides up to eight hours of talk time. Digital Spread Spectrum signal, originally developed for secure military communications, hops 90 times per second for airtight security. All calls are protected by 64-bit encryption. Next-generation wireless technology lets you roam up to 300-ft. from your desk. Smart Power Management limits range of transmission for additional security. Global Product Type: Headsets; Headset Type: Monaural; Headset Style: Convertible Heads-Over The Ear/Head; Earpiece Type: Leatherette Ear Cushions.