Tail light with illumination sensor auto mode. ■ 3 brightness levels + 4 flashing levels ■ Continuous light: 3 hours 45 minutes (10 lumens), 2 hours 20 minutes (15 lumens), 1 hour 20 minutes (35 lumens) ■ Flash: 17 hours (Flash 1/10 lumens), 5 hours (Flash 2/35 lumens), 16 hours 30 minutes (DAY flash/70 lumens) ■ hours charge Time: 2 hours; Weight: Light body 1.1 oz (30 g); Battery indicator included; Size: Approx. 2.2 x 1.1 x 0.7 inches (57.5 x 28.5 x 19 mm); Handle mounting width: 0.8 - 2.0 inches (20 - 52 mm); Waterproof for everyday life (IPX 4); Mode memory function; Accessories: Quick release universal bracket (compatible with aeropost); 2 diameter). 20-35 For 1.4 - 2.0 inches (35 - 52 mm) diameter), belt clip