I purchased this item but never installed it, and it has been in storage. I opened the package once to check if it works. Please refrain from purchasing if you are sensitive to minor scratches that may have occurred during storage. This smart device is perfect for security and visitor notifications. When combined with Edison Smart's "Door Sensor" or "Motion Sensor," it can alert you with a loud alarm of up to 100dB when motion is detected! It's useful for security at night or when you're away from home. You can choose from 32 different alarm sounds to suit the situation. It can be used as a security alarm for entrances, windows, and back doors, as well as for visitor notifications in stores and offices, monitoring children and pets, and ensuring the safety of elderly people who require care. Installation only requires a Wi-Fi environment (2.4GHz) and a smartphone; no construction or hub is needed! 【Motion Sensor】● Set Contents: Main unit x 1, Base x 1, micro-USB cable x 1, Adhesive sticker x 1, Screws & Anchors x 2 each, Instruction manual/Warranty card x 1 ● Size: Main unit: Approx. W45 x H70 x D37mm / Including base: Approx. W50 x H70 x D63mm ● Weight: 53g (including base/excluding batteries) ● Environment/Power: Battery-powered) 2 x AA alkaline batteries (sold separately) / Power supply) micro USB INPUT DC5V/1A ● Operating Environment: Temperature 0℃～50℃ / Humidity 10%～85% ● Current Consumption: Standby ≦81uA / Notification ≦110mA ● Detection Range: Angle approx. 128° Distance approx. ≦8m (depending on installation environment and angle), however, approx. 1m for movement directly in front of the sensor ● Indoor use only 【Communication/Network】● Communication Method: Wi-Fi ● Frequency Band: 2.4GHz band (5GHz band and IPv6 not supported) ● Standards: IEEE 802.11b/g/n ● Encryption: WPA/WPA2 ● Supported OS: iOS 10.0 or later / Android 6.0 or later ● Smart Speakers: Compatible with Amazon Echo (Amazon Alexa) / Google Home (Google Assistant) Edison Smart