Size / 1.14 x 1.14 x 0.23 inches (29x29x5 mm)
Weight / 0.18 ounces (5 grams)
Up to 130 feet (40 meters) range, in line of sight.
Replaceable CR2016 (90mAh) watch battery.
Up to 8 months battery life.
Bluetooth 4.0 (Bluetooth Low Energy) wireless communication.
iOS 8.0 (or later) devices with Bluetooth 4.0: iPhone 4S, 5, 5C, 5S, 6, 6Plus; iPad Mini, iPad 3rd and 4th Gen; iPod Touch 5th Gen.
Compatible Android devices with Android 4.3 (or later) and Bluetooth 4.0: Samsung Galaxy S3, S4, S5, Note3, Note4; Google Nexus 5, 6; LG G2, G3; HTC One; Sony Xperia Z2, Z3; Moto X.