The most rugged FLOATING handheld VHF Drop it on a deck or drop it in the water, the HX-750S is designed to take on the roughest of seas and keep you communicating all day with it's ergonomical shape and diecase chassis. Advanced features Built-in thermometer, Volume and Squelch indicators on the display. SOS Strobe light, Programable Scan, Priority Scan, Dual Watch, and speaker microphone connector. 6W Transmit power Higher TX power allows you to talk further and clearer than lower powered VHF's Speaker Microphone Accessories There are 3 different Speaker microphones are availalbe, including one that is fully waterproof. A minature earphone microphone and VOX headset are also available as after market accessories for the HX-750S. Power supply options The HX-750 is normally powered using its internal 1150mAH Li-Ion battery, but can also be powered from AAA drycell batteries in an emergency using the FBA-38 dry cell adaptor. 6 watt Transmit Power Ergonomical Shape Volume and Squelch indicator on Display SOS Strobe light External Speaker Mic Jack Preset Key ( 10 Channels) 700mW Audio giving loud clear audio Built in thermometer sensor Selectable TX Power Output 6/5/2/1 Watt 1150 mAh Rechargable Li-Ion battery AC with cradle included. Keylock Size 62 x 141.5 x 41mm ( excluding knob and aerial)