You can simply attach it to your clothing or pack with a one-touch, detachable clip, or directly to your bicycle via the included rubber strap. Features:- COB LED (35 lm)- Low profile round shape- Clip-on bracket for easy installation to backpacks, saddle bags and clothing- Li-ion polymer rechargeable battery- USB rechargeable (Micro USB cable included)- Low battery indicator- 6 modes *Charging time: 2h- Mode memory function- Battery Auto Save (Lighting mode automatically changes to slow flashing when the battery power gets low)Specifications:Dimension:- 45.5 x 44 x 16 mmWeight:- 16.5 g (with batteries)Light source:- COB LEDBattery:- Lithium Polymer rechargeable batteryRuntime:- High mode: 1 hr- Low mode: 10 hrs- Flashing mode: 30 hrs- Rapid mode: 10 hrs- Pulse mode: 10 hrs- Vibration mode: 13 hrsRecharge time:- 2 hrs (USB recharge)Mount size:- Clip bracket, Universal Band (φ26-32mm)Other:- Battery auto save, Low battery indicator