Specifications:  

Material: ABS

Appearance size: 37*37*6MM

Applicable system: IOS 7.0 above, Android 4.4 above

Product colors are: black, white, red, green

Note: APP application downloads:

Android and IOS download APP

Bluetooth version: Bluetooth 4.0

Battery: CR2032 lithium coin battery (not included)

Working distance: Will notify when within approx 75 feet (accessibility)