You need to open up the control panel (box) to see what size battery you need. The internal sounder will activate when you open the lid, enter your code to silence the alarm. Pull off the red and black wires connected to the battery and replace with a new battery. MAKE SURE YOU CONNECT IT RED WIRE TO +VE AND BLACK WIRE TO-VE or you will 'blow' the circuit board. Replace lid, reset alarm, job done.
alarman
July 2009