Used To Extend The Range Of OLAS Man Overboard Locator Up To 100 Foot Vessels; 5 Volt Power/ 13 To 17 Milliampere Current; Built-In Rechargeable Lithium-Ion Battery; 80 Hour Runtime; 3 Hours Recharge Time; IP67 Waterproof; FCC/ ROHS/ RED/ CE Certified; Black And Clear/ ABS Plastic; 3-1/2 Inch Length x 1-1/2 Inch Width x 3.6 Inch Height; With USB Charging Cable