199774 Quantity 1 piece(s) per pack Color Black Material Plastic + aluminum alloy Suitable Gun Type Suitable for 20mm rail gun Laser Wavelength 650nm Laser Power 2.5mW Specification Powered by 1 x CR1/3N battery (included)， anti-shock and water resistant. Packing List 1 x Red laser scope sight 1 x Hex wrench 2 x Cotton swabs 3 x Plastic mattress