The GT-3TP Mark-III is an Upgraded Version of GT-3 with Tri-Power (8W/4W/1W). - New 23CM High Gain Antenna allows GT-3TP to transmit much further. - It comes with a SainSonic Car Charger for charging on the go. - It also comes with an upgraded Antenna connector, Radio Frequency IC, FM Receiver Chip, Power Amplifier IC, etc. Feature: Frequency Range: 136-174 & 400-520 MHz Tri-Power: High / Med / Low Power (8W/4W/1W) 23CM High Gain Antenna: allows GT-3TP to transmit much further Big buttons & knob: GT-3TP has a built-in PTT key, CALL key, and MONI key on the left side of the radio Antenna Interface: Fine copper antenna connector outperforms previous antenna connectors and improves communications. Radio Frequency IC: Upgraded Squelch enhances interference rejection RDA1846S IC adds a new tail tone elimination function. Improved receiver AGC for when signal strength changes are severe FM Receiver Chip: The RDA5802N has a powerful low-IF digital audio processor. This makes it have optimum sound quality with varying reception conditions. Power Amplifier IC: Low crossover distortion, Low quiescent circuit current. Provides plenty of clean, clear receive audio. LED Flashlight: high lumen output Shell: Upgraded shell: Dustproof SPECIFICATIONS: Mode of operation: Simplex or semi-duplex Memory channels: Up to 128 Frequency stability: 2.5ppm Antenna impedance: 50 ohm Squelch from 0-9