brand new and high quality Features: Advanced Brake Sensor: Raz pro bicycle tail light is built with most advanced brake sensor technology, automatically switches to brake light mode in high brightness when decelerated. Raz pro is set up with different braking algorithm under different riding occasions. Thus, enhances the brake sensitivity and reduces the brake misjudge. which will greatly Improve your safety. Auto Group-Sync: Perfect for team rides. The innovative auto group-sync feature set all the Raz Pro lights in your group to the same flashing pattern for more safety in 3 seconds, without App control, either by joining freely or setting team code on App. When mounted both on helmet and under-seat, it creates a strong signal for improved visibility. Intelligent Sensors: Raz pro tail light is built with intelligent sensors and back-up features for a truly safe ride: Light Sensor, Auto Brake Alerts, Road Bump Alerts and Auto Wake-Up. 8 customized light Modes, magnetic rechargeable. Up to 80hrs super working for time for one single charge, excellent IP68 waterproof rank. Fully Visible Day and Night: Featured with Full-Color Daytime Light, Raz is versatile. You can pick and choose between a full range of color options for the light via the Shanren Sports App, adjust the flashing modes and select preferred patterns. 270-degree beam angle and 60 Lumens of brightness make sure you are seen from up to 1,000 meters. for Seat post/Helmet Saddle: Comes with a Twist & Lock mount and optional brackets for round or aero for seat post, saddle or helmet. You will be able to fix the tail light in place in no for time and it will stay securely in its place even throughout the bounciest of rides. for Smart Bike Tail Light only, other accessories demo in the picture is not included! Specifications: Name: for Smart tail light Model: SR-BTL20 Connection: BLE4.0 Battery: Rechargeable Li-battery Recharge: Magnetic charging Recharge time: 2 hours Work time: 24-80 hours Waterproof: IP68 Material: PC Size: app.4.1x4.1x1.9cm/1.61x1.61x0.75in Color: As the pictures shown Recharge: Magnetic Charging Optional Style: A(Seatpost Style), B(for Seat Cushion Style) Quantity: 1 Set Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 Set x for Smart Bike Tail Light