5188 16 Channel Waterproof Long Range Walkie Talkies, IP67 Floating 2 Way Radio Rechargeable, Two Way Radio for Kayaking, Rafting, Hydro Flying Features: 1) Output: High Power 2) Frequency Range: 400-470MHz 3) IP67 waterproof and dustproof (Not diving) 4) High & Low Power Switchover 5) Battery Saving 6) Time-out Timer (TOT) 7) Voice Prompt 8) Busy Channel Lock Function 9) Low Battery Warning Package Include: 1 x Portable radio 1 x Antenna 1 x Li-ion battery 1 x Charger 1 x Belt clip 1 x Sling 1 x User麓s manual GENERAL Frequency Range400-470MHZ Power Output3W Number of Channels16 channels Audio Distortion鈮?% Carrier Tolerance35pmm maximum frequency deviation鈮ぢ?KHz Noise radiation60dB Adjacent Channel Power60dB Sensitivity0.20渭V Adjacent Channel Selectivity60dB Operating Voltage3.7V Dimensions (mm)97 (W) x 102 (D) x 40 (H) Weightabout 0.45KgHandheld Radio Single Band manufacturers website:http://www.sifang-radios.com/two-way-radios/handheld-radio-single-band/