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 Key FeaturesBuilt-in acceleration sensor to detect deceleration under braking Highly waterproof and durable against vibration with long battery life and brake light feature 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 FlexTight™ (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 bag2x AAA batteries included Bike Lights Buying Guide