Product Review

Compatible With: DSC ER34615M-T1 WT4911 WT4911B WT8911 Wireless Outdoor Siren WT4911BATT ALEXOR ADT. Please pay attention: The WT4911 contains a battery that includes a feature called 'passivation'. This feature preserves the shelf life of the battery when it is not being used. Every WT4911 will need to be 'depassivated' before using the outdoor siren for the first time. NOTE: Make sure to follow the steps below for a brand new battery on the unit or if a battery is being replaced. The WT4911 could lose power prematurely if a brand new battery is not used. 1. Hold the tamper switch closed before plugging the battery in. 2. Plug in the battery AND continue to hold the tamper for 10 seconds before releasing it. 3. Once the tamper is released, after the initial 10 seconds, the siren flashes the strobe in several different patterns to indicate it is in depassivation mode.