Directed Notstromversorgung 12 Volt, 0.7Ah

This optional back-up battery adds to the security of any install,
maintaining power delivery to your security system even if would-be
thieves try to silence the siren by disconnecting your vehicle battery.
Sealed 0.7 amp/hour lead/acid battery powers and triggers the alarm when
vehicle's battery is disconnected. A must for any high-security
installation.