If you are fed up with replacing your fire extinguishers, this sturdy, tamperproof, self contained alarm is the answer. It has proven highly effective in helping stop theft, misuse or vandalism of fire extinguishers. Yet, it leaves the extinguisher accessible for emergencies and does not interfere with fire fighting in any way. How it works: If the protected fire extinguisher is moved from its normal position, the device emits a piercing alarm. Also, the highly visible stop sign design and the words “STOP, EMERGENCY USE ONLY” discourages wrongful use. The device is easy to install and a deactivation cable is supplied for ease in servicing the extinguisher. A 9 VDC alkaline battery is included.