Long running battery-powered rear light with high waterproof rating of IPX7. Built-in "Brake Mode" function will alert others behind you of your deceleration. - Built-in acceleration sensor for Kinetic mode (Brake mode) - Automatically turns on Hi for 2.5 sec when bike deceleration is detected - Waterproof IPX-7: Operates even after 30 minutes of submersion in a depth of 1 meter - Long runtimes - 360 degree visibility - 5 LEDs - 3 modes - Mode memory function - FlexTight SP-11 bracket (12-32mm) - Snap System - Flashing Mode: 160 Hrs - Constant: 70 Hrs - Rapid Mode: 140 Hrs