Opening Transmitter on Safewatch 3000EN

I have a Safewatch 3000EN (the user guide actually has 3 diff systems on the cover) & am getting the message on the keypad that one of my wireless sensors needs battery replaced & I can't seem to pop/pry open either one of them.

I live in an apt. & have the IR sensor in the bedrm & a small sensor on the sliding door. The door sensor is apprx the size of 2 iPods stacked on top of each other, like 1/2 a pack of cigs.

The system isn't monitored so I don't want to call ADT & get chrgd an arm & a leg. I think the system is apprx 3-4 yrs old.

Any help is greatly appreciated.

THANKS!!

 

The door transmitter is a standard Ademco device (probably a 5816). To remove the cover, you gently insert a small flat screwdrive into the short end opposite the ribbed decoration on the housing and twist. If you look carefully, you will see the slot.

The motion also has a similar slot on either the top or the bottom edge (there are a couple of models and some are opposite of the others...).

The batteries are pretty common and run about $US 6.00.

 

I see a slot & it looks like it has a little tab in it.
The sensor sits high on the jam area of the door.
If I am looking up at the sensor the slot with tab is to the left.

Is there a way for me to upload a pic just to make sure?
I'd hate to ruin the sensor.

 

Look at the transmitter, there should be a set of decorative grooves on one end. You use the screwdriver on the opposite end from the grooves.