STANDARD HORIZON HX-380 HH 5 WATT VHFSTANDARD HORIZON HX 380 HH 5 WATT VHF HX380 5W Commercial Grade Submersible IPX 7 Handheld VHF Radio with LMR Channels Building on the success of the HX370S, the HX380 5W Commercial Grade handheld VHF has been upgraded with a 1600 mAh Lithium Ion battery, providing more than 13 hours of use on a single charge (5 5 90 duty cycle). The HX380 had been engineered for unparalleled reliability and exceeds the IPX7 waterproof standard for submersion, 3. 3