Entel HT644 Marine VHF Two Way Radio is a no-compromise marine portable rugged two-way radio with an ergonomic design that fits comfortably in your hand. The HT644 Series 2 portable is built to MIL-STD 810C/D/E/F for tough enduring performance and in addition and is fully Submersible to IP68 (2 meters depth for 4 hours). Featuring environmental protection to IP68 (2 Meters for 4 hours). Meets MIL-STD 810C/D/E/F and providing commercial grade construction for tough, enduring performance. 2000mAh Li-Ion battery. Channels - The HT644 portable provides all INT, USA & CAN Marine channels.