Addmotor Bicycle Bike Cycling Safety Zone Tail Light 8 LED with 2 Laser Item Location:United States. Items delivery time about 5-7 days We work hard to provide the best product possible by using premium materials and workmanship and stand by our products 100%. In order to quality control our products, Addmotor IS THE ONLY COMPANY AUTHORIZED TO SELL THE Addmotor BRAND Dimensions: 3.27 x 2.75 x 1.8 Inch.Net Weight: 60g Gross Weight:110g . Fit For 20-31.8 MM Seatpost Laser Wavelength: 650nm (red) .Output Power:  100mw .Waterproof Function:IP 65 (Works normally in rain). Working Time: Continuous Working Time About 6 Hours(Full Charging).Charging Time: 2-3 Hours