Best Alarm Siren External Deals Online in the UK (10 Deals Found)

Last Updated - 14/09/2026 Sort By:

Best Choice
Yale

New
Yale AC-PBX Powered External Siren - Sync Alarm Accessory - Mains Powered, 104 dB Siren, Tamper Alarm, 200m range
SYNC ALARM ACCESSORY: The Yale Powered External Siren is the ideal visual deterrent for arming your home and improving y

£78.60
Wholesale Security

New
Live External Bell Box for Wired Intruder Burglar Alarm System - Delta Shape - Twin Flashing LED, Strobe, Anti-Tamper, B
FOR WIRED ALARM SYSTEMS

£43.56
Best Value
eufy Security

New
eufy Security Siren, 105 dB Wireless Alarm, IP65 Weatherproof
Scare off would-be intruders and alert the neighborhood with this wireless 105 dB indoor/outdoor siren.

£29.99 £39.99
ALIBELL

New
ALIBELL Panic Alarm System Remote Siren Kit (Battery & Plug-in Power Use)
[Wireless Strobe Siren Alarm] 1 portable flashing siren and 2 panic call buttons form a wireless strobe siren alarm syst

£49.99
SimpliSafe

New
SimpliSafe Bell Box - Wireless External Siren with 105db Alarm and Red Flashing LED Security Light Deterrent. Compatible
UPGRADE YOUR SIMPLISAFE SYSTEM: Compatible with your SimpliSafe home security system (3rd gen). Add up to 100 accessorie

£69.99
WOLF-GUARD

New
Wolf Guard 433MHz Wireless Strobe Siren Alarm
DURABLE CONSTRUCTION: Door alarm is made of flame retardant ABS plastic, robust and durable. Fashionable and waterproof

£26.69 £29.00
27% Off
Bosch Smart Home

New
Bosch Smart Home outdoor siren, wireless alarm system, warns by 3-fold alarm audible, visible and via push notification
Wireless outdoor siren with solar panels for 230 V or 5-28 V

£148.72 £204.05
28% Off
Yale

New
Yale AC-DBX Dummy Siren (with Flashing LED) - Sync Alarm Accessory
SYNC ALARM ACCESSORY: The Dummy Siren is ideal for creating the appearance of an alarm system and improving your home se

£22.99 £31.99
WOLF-GUARD

New
Wolf-Guard JD-W06 Wireless Siren, 433MHz Outdoor Flash LED Solar Strobe
Dual Function Design: Loud sound siren with flash bright light when the alarm is triggered. 2 in 1 design can work as a

£43.99
Pyronix

New
Pyronix Deltabell Plus LED Backlit External Piezo Sounder Alarm Bellbox Bell Box with Blank Cover - Blue
The base of the Deltabell Plus is backlit constantly providing a visible deterrent to warn of intruders. Piezo sounder t

£59.99

10 Alarm Siren External deals are available from: Amazon stores, starting from £22.99.
The biggest discount we found is 28% on Yale AC-DBX Dummy Siren (with Flashing LED) - Sync Alarm Accessory at Amazon.
The lowest price we found is £22.99 while the highest is £148.72.
Prices for the best Alarm Siren External deals average at £57.45.
Last updated on September 14, 2026.
We scanned these quality online stores and more to deliver you with the best offers online available for Alarm Siren External.