Knog Plug is a rear flasher suitable for any cyclist looking for a bright and easy to attach light with excellent visibility from different angles. It is made of silicone and features a domed rear lens to improve side visibility. The battery life with eco-flash mode is up to 100+ hours of operation and has 5 modes. The light is 100% waterproof and all weather resistant. 3 different lengths of silicone rubber bands are included for attaching to handlebars. Weight: 30 g Light output: 10 Lumens Battery capacity: 220 mAh Battery life at max output: 1.2 - 2 hours