Specifications: Dimensions: 2 1/4 (W), 5 1/2 (H), 1 15/32 (D) inches, 13.8 oz MIL SPEC C/D/E Frequency range:  450-490 MHz* 500 mW audio output Simple*  versions 250 channels either 12.5 kHz or 25 kHz Advanced trunking performance: High speed PLL lockup provides, Faster acquisition times and, Efficient trunking performance Built-in signal strength indicator (RSSI) Seamless roaming under PassPort® protocol as the IC-F4TR automatically registers with the nearest site (Does not rely on BER calculations which slow down the registration process.) LTR® features: 50 systems up to 100 groups per system PassPort® features: 60,000 useable ID's, individual mobile ID's and roamer ID's ESN (electrical serial number) check Message trunking OTAR (Over the Air Re-programming) Automatic registration Call forwarding and voice mail NiMh battery and Rapid Charger 8 character alphanumeric display CTCSS and DTCS signaling are standard Up to 7 dealer-programmable switches and keys Rugged die-cast aluminum chassis, polycarbonate case