Standard Horizon HX210 Handheld Marine VHF Transceiver Compact, ergonomic case design is a result of the new internal, large capacity 1850 mAh Lithium Ion battery technology. This gives the radio a much smaller case design yet light enough to float face up if dropped in the water Water Activated Emergency Strobe light If the radio falls in the water an emergency strobe light is automatically activated, even when the unit is turned off!!! The strobe can be reconfigured to flash on and off, flash