Perfect for finding your keys, bag, backpack in seconds. RANGE: 200ft - line of sight (60m)THICKNESS: 0.2in (5mm)SIZE: 1.38in ø (35mm ø)WATER RESISTANT: NoBATTERY LIFE: 9 months replaceableCOMPATIBILITY:Compatible with iOS 10 and later, and devices running Android 4.4 and later.See full list of officially supported devices.VOICE CONTROLLED:Works with Google Assistant and Amazon Alexa on smart speakers and mobile devices with the Google Assistant or Amazon Alexa app installed