1. Solid galvanized steel construction, perfect for outdoor security. 2. Can be mounted on fencing, sheds, etc. Requires 12g blanks, 3. This device produces a loud bang and flash when used with a 12 bore salute blank. All necessary measures must be taken to ensure safe deployment and use. Do not place in a position where report or flash may cause injury to humans or animals. Ensure the device is not placed where children can access it. Do not deploy where a fire hazard is possible. Unless you are certain that the above conditions are met, do NOT deploy this device. Color: Silver Material: metal Package Contents: 2 x Alarm Device Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.