If you have an AVA alarm it wont work with most sounder boxes due to their anti theft design of the day. This mod fixes it so that you can use it with the ATTx V1 V2 and other sounder boxes.

Simply add this mod sale to the shopping cart then update the basket to reflect the number of AVA's you need modding and submit your order. Then post them to the PO box address on our contact page with a copy of your purchase confirmation email, and we will do the job and send them back normally within 2-3 working days! We recommend using a registered and insured postage service when sending to us.