• Intelligent induction brake with integrated high-density speed sensor. The red light activates for 5 seconds upon detecting deceleration, enhancing safety with an irradiation distance of 100-300 meters. • Automatic alarm mode: the rear light enters sleep mode after 20 seconds of inactivity and automatically reactivates upon detecting vibration. • High battery life: 800 mAh with universal USB interface. Up to 35 hours in running light mode 1, 17 hours in running light mode 2, and 20 hours in dual flash mode. • IPX5 waterproof: high-quality material with good sealing, resistant to rain and splashes. Equipped with 16 red 3014 LEDs. • Easy installation: includes mounting and saddle brackets. Easily installs on the seat post or under the saddle with a silicone strap. • Specifications: product size 135 x 30 x 35 mm, net weight 55 g, black color with red cover, polycarbonate material.