Yale Easy Fit KIT2 Alarm Control Panel & Sensor Backup Battery Pack EF | eBay
PCB Flasher Blue LED Battery Box Dummy Alarm Siren Security Bell Flash Circuit | eBay
XCELPLUS Siren Bell Box Alarm Battery intended for use with Pyronix DELTABELL used as a replacement for BATT-ES1, DELTABELL-WE, DELTABB-WE and LEDRKP / WHITE-WE, (BATT-ES1-2PCS) : Amazon.co.uk: DIY & Tools