External wired alarm connectors: 1 channel external wireless siren, 1 channel. Siren output：<500mA. GSM system：850/900/1800/1900MHz. Support the alarm such as battery problem, low power battery anti-pry alarm etc.
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HEIMAN Zigbee 3.0 Fire alarm Smoke detector Smart Home system 2.4GHz High sensitivity Safety prevention Sensor Free Shipping
Aliexpress UK
External wired alarm connectors: 1 channel external wireless siren, 1 channel. Siren output：<500mA. Support low power for wireless parts, Tamper alarm function. GSM system：850/900/1800/1900MHz. Support the alarm such as battery problem, low power battery anti-pry alarm etc.
eBay
KERUI Wireless 433MHz D025 Window Door Sensor Magnet Detector For W181 W184 W204 Home Security Alarm System Burglar An-theft
Aliexpress UK
External wired alarm connectors: 1 channel external wireless siren, 1 channel. Siren output：<500mA. GSM system：850/900/1800/1900MHz. Support the alarm such as battery problem, low power battery anti-pry alarm etc.
eBay
Tuya WiFi/Zigbee Door Window Sensor Smart Home Wireless Door Detector Door Open / Closed Alarm System work With Tuya Smart Life
Aliexpress UK
Sound index: 120dB. At 120dbs, this siren will not only alert the neighbors of the intrusion, but scare away the burglar right out of your house! This piercing, plug-in siren can be plugged into your keypad/Console.
eBay
2.4GHz WiFi Wireless Video Doorbell Two-way Intercom Doorbell Camera APP Control Smart Door Bell for Home Security Alarm System
Aliexpress UK
Wildly Use: The smart alarm supports a variety of advanced alarms, such as main power failure, low backup battery, and burglar alarms. Wi-Fi 4G Dual Network: Works with a 4G SIM card, the app, or both.
eBay
KERUI W184 4G WIFI GSM Alarm System Unit Wireless Home Tuya Smart APP Control Motion Sensor Burglar Support Alexa Motion Sensor
Aliexpress UK
Turn any traditional wired home alarm system into a Smart Alarm controlled via an App on your mobile. Receive intruder alerts. Assess false alarms and reset the alarm remotely. Fits inside your alarm panel. Easy to install. Works with Texecom, Pyronix, Gardtec, HoneyWell, Ademco, Cooper, Regalsafe, Veritas, Accenta, SecureWatch.
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Awapow Wireless Door Alarm With Remote Control Anti-Theft Door And Window Security Alarms Home Security Sensor Burglar Alarms
Aliexpress UK
Yale AC-PBX Powered External Siren - Sync Alarm Accessory - Mains Powered, UK 3 Pin Plug, 104 dB Siren, Tamper Alarm, 200m range The Yale Sync Powered External Siren is an accessory of the Yale Sync Smart Home Alarm (NOTE: This product does not work with EF and SR alarms) Sync Powered External Siren The Yale Sync Powered External Siren is easy to pair with your Yale Sync Smart Home Alarm. Technical Specification Easy to install 104dB noise 200m range Tamper proof Sync Alarm Accessory Cable length is 175cm with plug. UK 3 pin mains plug.
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2-in-1 Carbon Monoxide And Smoke Detector Alarm Electrochemical Sensor 85db LCD CO Alarm Smoke Alarm for Home Hotel Safety
Aliexpress UK
Can be used on single, double or triple gang light switches. Colour White. Model: Atomic Beam Cop Cam. Colour: White. This can include remote or extended areas such as the Isle of Man, Channel Islands, Northern Ireland, Scottish Highlands, and similar regions.
eBay
Awapow Wireless Door Alarm With Remote Control Anti-Theft Door And Window Security Alarms Home Security Sensor Burglar Alarms
Aliexpress UK