177730 Quantity: 1 piece(s) per pack Color: Black Material: Aluminum alloy Suitable Gun Type: For 20mm rail guns Laser Wavelength: 532nm Laser Power: < 5mW Laser Reaching Range: 200 meters Battery: 1 x CR123A (included) Other Feature Water and shock resistant Packing List 1 x Gun sight (60cm-cable) 1 x Hex wrench 1 x Remote switch 1 x CR123A battery 1 x Rail mount