It will ring when the value reaches the point of pre-set max or min alarm values.
eBay
Lampenwelt UK
📡 Wireless Indoor & Outdoor Monitoring. Accurate Indoor & Outdoor Temperature & Humidity Monitoring – All in One Device. Indoor Temperature Range:-10°C to 60°C. Indoor & Outdoor Temperature. Indoor & Outdoor Humidity.
eBay
Lampenwelt UK
1 x LCD Weather Station. Indoor temperature ranges: -4°F - 158°F(-20°C - 70°C). Outdoor temperature ranges: -40°F - 158°F (-40°C - 70°C). HF radio frequency: 433 MHz. - Support backlight function. It can turn off automatically after 10 seconds without any operation.
eBay
Lampenwelt UK
It is suitable for desktop placing or wall hanging. Large LCD display, you can easily read the value. Adopt wireless technology，you can know outdoor temperature in indoor receiver. With portable transmitter to sensor outdoor temperature and transmit within 100m without obstacle.
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Enhanced Dual-Camera Clarity at 50 Feet: Capture every event that occurs around your home in ultra-clear 3K resolution. See exactly who is approaching your home with 8× zoom. Solar-Powered, Install Once and it Runs Forever*: Experience constant...
eufy
ThermoPro TP200C Indoor Outdoor Thermometer Wireless, Greenhouse Thermometer with Temperature Sensor Up to 150m, Outdoor Thermometers for Patio Garden Cellar Home Room
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Scare off would-be intruders and alert the neighborhood with this wireless 105 dB indoor/outdoor siren. Loud 105 dB siren makes sure the alarm is heard when a security risk is detected. IP65 weather-resistant design, so the siren can be used indoors...
eufy
It is suitable for desktop placing or wall hanging. Large LCD display, you can easily read the value. Adopt wireless technology，you can know outdoor temperature in indoor receiver. With portable transmitter to sensor outdoor temperature and transmit within 100m without obstacle.
eBay
Manufacturer Geevon. Tabletop or wall-mountable design for added convenience. Item Weight 170 g. Item model number 8688. Part number 8688. Mounting type Tabletop. Material ABS.
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Suitable for desktop or wall mounting. The large LCD display provides clear, easy-to-read readings. Using wireless technology, the indoor receiver can read the outdoor temperature. Records both indoor and outdoor high and low temperatures.
eBay