Headlight: 0.5 Watt LED, 100 hours run time; Includes 3 (AAA) batteries; Water resistant design; Side lighted body QR bracket (fits 25.4mm - 31.8mm) * Taillight: Ultra bright 0.5 Watt LEDs, 100 hours of run time; Includes 2 (AAA) batteries; Water resistant design; Multi fit QR bracket; 2 modes (steady & flashing)