There are two types of doorbells: 433MHz doorbell (can not connect to wifi) and wifi doorbell (can connect to WiFi). Tear off the 3M tape on the back of the doorbell button and paste it on a clean wall, and plug the doorbell host into the socket to use.
eBay
The advantage of 4G alarm system. Following the official closure announcement of 2G networks in United States, Canada, Mexico, Australia, Euro Union, etc. Worldwide cellular mobile network prvoides are considering ceasing 2G service with in-progress plans in coming years. Without 2G networks, 2G/GSM only alarm system will fail to achieve it's major function, remote control through calls and SMS. To provide customers with longer alarm system lifespan, our company is launching a series of it's 4G alarm system which are both 4G/3G/2G(GSM) Network compatible. Applicable Area US 4G alarm system work on United States, Canada, Mexico.(If use in USA, suggest use AT&T, T-mobile 4G Sim card). Euro 4G alarm system work on Euro Union, United Kingdom and other EU countries, Africa, Asia.
eBay
1. Compatible with Alexa and Google home: This alarm sysetm works with Amazon Alexa and Google Home for voice control ( Alexa and google home devices not included ). Just ask app Alexa on your phone to Arm / Disarm/ the whole system in a specific instruction. Remote control your Alarm system anywhere in the world with your smart cell phone, no need repeated operation! 2. WiFi & GSM Support and Auto Dialer Function: This alarm system support different alarm message info(APP Message Push / SMS Message / Voice monitoring / Sim card phone call).Wifi way. It will push alarm notification via free app when it is triggered. GSM Way: Insert 2G SIM card into the alarm system and save your phone number on it, then it will send message or call your cell phone when alarm alerts.
eBay
1 Wired Siren. Infrared Sensor Detector Battery: Use 2 AAA batteries ( include). WiFi Standard: IEEE8021b/g/n wireless standard. 4 Infrared Sensor Detector. Alarm Panel Battery: 3.7V, 1000mAh(built-in).
eBay
The sensors use infrared (PIR) technology to detect motions and surveil a designated area. This alarm system kit works effectively as a hunter safety system, hunting alarm, camping alarm, burglar alarm, and house/warehouse/yard/driveway security system.
eBay
Free downloadable Yale smart app ( NO FEES 👌). From Yales latest range of hugely popular alarm systems. Operate this alarm from your smartphone / tablet or smart watch. 1 x wireless external alarm bell.
eBay
For 4 Wheels cars and can recognize the tyre pressure 0~3.5 Bar. High Temperature / Leakage / Low Battery Alarm. Low air pressure/high temperature alarm. External Sensor （Optional）. Built-in Sensor （Optional）.
eBay
WiFi: 802.11 b/g/n. Alarm Sound Level:85db/1m. Alarm Current:≤220mA. Detecting Range:20m2.
eBay