Icom HM138 Waterproof Speaker Mic - M88 Icm88 Vhf Handheld Radio Unit Dimensions: 2.4375 W× 3.8125 H × 1.53125 L Transmit Power: 1 3 or 5 Watts Features: Waterproof 22 programmable channels for land use Auto WX scan and WX Alert function (U.S.A. version only) Simple Up/Down switches for operating channel selection Instant access to Ch. 16 and Ch. 9 (or call channel) Simple add/delete TAG scanning operation 2 step power saver 4 level battery indicator Self check function checks internal temperature connected battery voltage (over voltage detection) and water intrusion. Attributes: Description = Waterproof Speaker Microphone For ICM88