Standard Pack = 1 piece(s). Featuring a C4 LED, this lightweight unit offers three digitally controlled brightness levels. It also has an indicator that shows remaining battery power, and its 50,000-hour LED never needs replacing. Includes adjustable straps for a comfortable, secure fit, and three AAA batteries. IPX4 water resistant and 2 m impact-resistance tested. 2 1/8"H x 2 7/8"W x 2 1/4"D. Yellow.