Designed for small watercraft, dinghy, canoe, row boat, kayak, etc that are manually powered or less than 23' with speeds up to 7 knots. Provides safe navigating at night. The battery operated lights are compact, only 5½" long and use high quality long lasting LEDs. The special round plastic projector lens can be conveniently used as flashlight or spot light, Housing is made from high quality plastic with a rubber grip that is seawater resistant and incorporates a carabineer clip to allow for attaching to boat with a lanyard, Different mounting options with C-clamp, suction mount with flexible arm and special adapter for adhering to irregular surfaces (Suction cup use not recommended for high Impact high vibration applications). Requires 4 AAA Batteries (not included). The lights include 2½" flexible arm with adapter.