Can be used as a door stop alarm and door stopper, A protector around you. Just put the door stop security Alarm under the door and turn on the switch. It is the high damping rubber at the bottom which can prevent the door sliding.
eBay
2pcs Door Stop Alarm with 120dB Siren Portable Door Stopper Security Alarm for Home Hotel 3 Levels Sensitivity Door Wedge Alarm
Aliexpress UK
The Door Stop Alarm is a portable door stopper wedge that doubles as a security alert detection device.
eBay
Mini Wireless Alarm Door Stop Alarm 120dB Great for Home Wedge Shaped Stopper Alert Security System Block Blocking System
Aliexpress UK
Weight: 128g. • Portable Doorstop Preasure Alarm : The alarm system can be easily carried around, making it convenient to use in different locations. You can use it as common door stopper when turn down the ON/OFF switch,hold door in open position.
eBay
Portable Alarm Door Stopper Suction Cup Door Lock Brace not Alarm /Alarm Type Self-Defense Security Device For Anti Theft
Aliexpress UK
120dB high-pitched continuous siren when it is enabled. Type: Door Stop Alarm. Easy Install: No wiring needed, just put 9v battery in and switch the button on the back to “ON” then it can works. The bottoms are made of synthetic rubber for keep the alarm from slipping.
eBay
Easy Setup: Install in minutes all by yourself. The entry sensors attach to doors and windows, while the motion sensor and keypad can be secured to walls via the included mounts. No Monthly Fees: Designed to protect your home as well as your wallet,...
eufy
Weight : 0.11kg (each alarm). You Save £5.00. Material : Robust ABS plastic. Outdoor Garden & Patio. RRP £14.99. From £9.99. LED Tape + Power Supplies.
eBay
Elecpow Door Window Alarm Home Security Wireless Burglar Alarm Door Magnetic Sensor 120dB Anti-theft Alarm For Home Kids Safety
Aliexpress UK
Sounds 120dB siren when the door is pushed. Eagle Door Stop Alarm x 2.
eBay
Awapow Wireless Door Alarm With Remote Control Anti-Theft Door And Window Security Alarms Home Security Sensor Burglar Alarms
Aliexpress UK
Can be used as a door stop alarm and door stopper, A protector around you. Just put the door stop security Alarm under the door and turn on the switch. It is the high damping rubber at the bottom which can prevent the door sliding.
eBay
IMOU Home Wifi Alarm System Zigbee 3.0 Real Time App Push Motion Sensor Alarm Siren Window Door Sensor IP Camera Work with Alexa
Aliexpress UK
120dB high-pitched continuous siren when it is enabled. Type: Door Stop Alarm. Easy Install: No wiring needed, just put 9v battery in and switch the button on the back to “ON” then it can works. The bottoms are made of synthetic rubber for keep the alarm from slipping.
eBay
Camluxy Tuya WiFi Window Alarm Glass Break Sensor Alarm 130dB Anti-Theft Vibration Detector Alarm for Home Door Window Security
Aliexpress UK