Powerful: SURF keychain uses the latest COB LED technology. It offers you 100 lumens of diffused light: convenient for finding the lock, an object, lighting the machine ... Autonomy: with Velamp batteries it guarantees you 15 hours of autonomy in continuous use. Convenient: Equipped with a powerful magnet on the back, you can stick it on metal surfaces. It also becomes a handy tool in many situations. Compact: Measures 7cm long, 3.5cm wide and 1cm thick! you can take it everywhere and it won't get noticed!