The Topeak Redlite 30 is a compact, USB rechargeable tail light with a touch control switch. It features a super bright red LED that provides 30 lumens of rear visibility. The light can be easily mounted on the saddle shell using the included tool-free double-sided adhesive, which keeps it hidden. The integrated magnet allows for fast, easy, and secure mounting and removal.The Redlite 30 has a maximum luminous intensity of 30 lumens and uses a super bright red LED. It is powered by a 3.7V 300mAh Lithium Ion battery, which is integrated into the light. The light offers three modes of operation: constant (30 lumens for 6 hours), blink (15 lumens for 40 hours), and sequence (15 lumens for 30 hours).Charging the Redlite 30 is convenient, thanks to its USB Type-C port. It takes approximately 2-3 hours to fully charge the light. The input voltage is 5V with a current of 500mA. The lamp housing is made of engineering grade polymer and is waterproof with an IPX6 rating.The Redlite 30 measures 4.6 x 3.6 x 1.2cm (1.8"" x 1.4"" x 0.5"") and weighs 30g (1.06oz). It is a reliable and versatile tail light that provides excellent visibility and safety while cycling.