There are legitimate reasons to have a manual on/off switch: 1. In case of electrical failure to extend battery charges for 2-way communication. 2. If the dev

There are legitimate reasons to have a manual on/off switch: 1. In case of electrical failure to extend battery charges for 2-way communication. 2. If the device goes nuts and is better off. 3. To be turned off so that it doesn't interfere with a backup transponder.