Entel HT 644 provides all INT, USA & CAN Marine channels, select 1W or 5W power and 56 channels. It also has the ability to program extra channels within the Marine band, it is completely waterproof with durability standards IP68 (5m depth for 1h) and MIL-STD 810 C / D / E / F. Finally, it has a battery status indicator, a large backlit LCD screen, VOX function and a special type of waterproof connector for H / F use.