The Moon Alcor rear light delivers 15 lumen of output from a compact and lightweight design, making it perfect for increasing your visibility while commuting. Moons Alcor has a Day Flash mode to enhance your presence during daytime hours. Magnetic mounting is simple and quick for rear light security. Key Features: Ultra brightness red LEDDay flashLight mode memoryMagnetic mounting RB-29-R250mAh Li-Po Built-inMax. Lumens: 15LMMax. Runtime: 70 hrsRecharge time 2 hrsSize (W x D x H): 31 x54 x 18mmWeight: 0.017Kg; Packing & Package: 0.1Kg Mode            Lumen   Runtime MODE 1        3            8:00 MODE 2        6            4:00 FL 1               3            70:00 FL 2               8            40:00 DAY FL          15          30:00