odel Name/Number UL5D UltraLITE Brand Eartec Transmission Speed 1.152 Mbps (Baud Rate) Duplexing Time Division Duplex (TDD) Modulation Type GFSK Channel Bandwidth 1.728 GHz Channel Tuning Step 1.728MHz Speech Encoding ADPCM / 32bit/s RF Accessing Time Division Multiple Access (TDMA) Operation Time 6 Hours Set Contains 5 Piece Charge Time 3 Hours Charger Power Supply AC / adapter: INPUT 110-40Vac Headset Power Supply Rechargeable Lithium 3.7 V/ 800 mAh 3.0 Wh Usage Type TDMA Maximum Transmit Power 100mW Adjustable Mic Boom Rotates 270 degrees, worn on left or right ear Auto Mute Mute microphone simply by moving the boom to up position Li-Poly Batteries Provide continuous 6 hr operation and are field replaceable DECT Frequency Digital 1900 MHz band is interference free Excellent performance Range up to 1/4 mile Volume Control Simple up / down push button adjustment Water resistant Silicone sealed for use outdoors in inclement conditions Preferred Frequency (MHz) TX/RX: 1921.536 ~1928.448MHz Euro Frequency 1880 – 1900MHz (EURO) Frequency 1920 – 1930MHz (USA) Standard DECT 6.0 (Digital Enhanced Cordless Telecommunications) Tuning Range Receive (MHz) 1921.536 to 1928.448MHz