Input voltage (V): DC 3.7V Luminous efficiency of bulb (length/width): 80 Service life (hours): 15000 Working hours (hours): 20000 Product weight (kg): 0.1 Lighting period (hours): 6 Battery type: Li-ion Lamp body material: ABS Color: Black Light source: LED Product Name: COB headlamp Battery: Built-in battery Material: ABS plastic Mode: Strong/Strobe Charging method: USB charging LED type: COB Weight: 92 grams