Bonin B-Stad Underworld rear light, high visibility and brightness guaranteed by 20 chips COB LEDs. The light allows 6 operating modes: constant light - slow flash - Fast flash - Flash D- Breathe flash - shutdown. It is also equipped with a braking and automatic reactivation sensor: after 4 minutes of inactivity, the light enters the SLEEP mode, to immediately return to the original mode as soon as the vibration warns. Degree of IPX4 waterproofing. Rechargeable battery with lithium polymers (3.7 V/400 mAh), equipped with USB C cable, charging time: 2.5-3 hours. To recharge the light, just unscrew it from the support that remains fixed to the back frame.