The all new tight kinetic rear bike light packs a punch with cateyes kinetic brake technology. The built in acceleration sensor for kinetic mode that automatically changes the light from low or flashing mode to high constant mode to perform as a traditional brake light. Highly waterproof and durable against vibration the 2 x aaa batteries gives incredibly long life performance whilst the 360 degrees of visibility give you the confidence to know that you ill be seen and be safe features built in acceleration sensor to detect deceleration under braking waterproof design waterproof performance ipx7 long battery life of up to 180 hours rugged body with resistance to vibration while riding achieves 360 degree light distribution high brightness low power consumption design using 5 leds equipped with 3 modes 2 flashing modes 1 constant mode easy switching between constant and flashing with one button mode memory function turns the light on in last used mode flextighttrade sp 11 bracket can be fast and securely fixed to the seatpost and seatstay without tools. Compatible with clip c 2 to attach to pocket or bag 2x aaa batteries included only 49g mode output runtime low approx. 70 hours flashing approx. 160 hours rapid mode approx. 140 hours the more frequently the brake kinetic mode works the shorter the operating time. Technologies kinetic brake modeautomatically turns on high constant mode when slowing down to work like a traditional brake light opticubetradeour proprietary opticubetrade lens technology maximizes brightness for greater visibility. Side visibilityprovides visibility from the side to increase safety. Flextighttradethe innovative and versatile flextighttrade bracket can quickly and securely fastened to virtually any handlebar or stem with no tools required daytimecan be used in the daytime. All weathercan be used in rainy weather