Specifications: 1) Double-sided flashing 2) Lamp house: super high brightness LED 3) Flashing frequency: 65/min 4) Error frequency: +5% 5) Light color: yellow & red 6) Voltage: 6V and 12V 7) Power: 8) Visible distance: 450m-500m Inner switch: 1) Flashing: automatic On/Off at night/day 2) Power switch: shut off the power 3) Two shunt-wound batteries of 6V(4R 25) can supply power for 650-750 hours Packing: 12pcs/carton Carton size: 48 x 38 x 37cm N.G.:7kg