The AUTHOR SQUARE COB USB features superior visibility with hi-end COB LED technology, providing a new level of safety. Build in nylon plastic case with strong alloy frame. - COB LED technology 40 lm. - Rechargeable Li-ion battery (min. 500 charging cycles). - USB 2.0 A/Micro B charger cable included. - STEADY MODES: 12 lm – 5 h, 15 lm – 4 h, 30 lm – 2 h. - FLASHING MODES: 20 lm slow flashing – 10 h, 40 lm quick flashing – 5 h, 40 lm slow flashing – 5 h, 40 lm day flashing – 8 h. - Adjustable tool free bracket with silicon strap for diameter 15–35mm even the unround profiles. - Clothing clip is attached in packing. - Battery capacity indicator (Red light = capacity is 1–20 %). - Charging indicator (Steady red light = charging , steady green light = full charged). Charging time 1 h aprox.