This is a wireless external siren that works with the JNWR-6 alarm.
The siren comes with a 12v power adapter to power it and has an internal back up battery in case of power failure.
A control box powered by another 12v adapter houses a time delay circuit and wireless transmitter. This control box is wired to the terminal on the front of the JNWR-6 receiver or and when the receiver is triggered , a wireless signal is sent to the siren which then sounds the 120db siren and the strobe lights flash for 5 minutes