DESCRIPTION Our best selling bike tail light is better * * * * M2, compact (32 g, 3.5 cm), rechargeable (USB) and waterproof (IPx 5), with great improvements in every aspect, becoming a bike tail light in terms of durability champion. Better autonomy with up to 90 hours of lighting time. Fixed mode, brightness increased by 30% (exclusive). There is more than one kind of mountain bike light, i.e. helmet light, backpack light, dog light, scooter light, wheelchair light. Unlike other products * * * * * * They may look the same and sell for less, but they are not the same. Every penny you spend counts, and the M2 offers 5 unique settings for increased brightness and longer life: Fixed mode, 30% brighter (DONPEREGRINO exclusive, 6 hours), Flash mode (90 hours, comparable product There are no competitors in), Strobe (15 hours), Flash Meteor (23 hours) and Flash Tai Chi (27 hours). Perfect to accompany you on long trips or group rides. IPX 5 Waterproof and USB Rechargeable* * * * Our LED bicycle tail light features a waterproof and rain-sealed housing, making it your reliable companion in inclement weather. 2 hours of charging = 6 to 90 hours of operation. For fast charging, simply connect the bike taillight to any USB device such as a power bank, car charger or AC outlet adapter. (Please fully charge before first use.) Fits Every Bicycle* * * * This rear LED mountain bike installs without tools and fits all types of bikes, road bikes, mountain bikes, hybrid bikes or touring bikes.