Camera Shutter Remote Control Specification: Frequency: 2.4 GHz - 2.4835 GHz Max Range: 30ft (10m) Battery Life: Approx. 6 months using 10x/day Exchange battery : Standard button cell battery CR2032. You could buy it from your neighbour shops Dimensions: 48mm x 30mm x 10mm Warm Tips: To record video with the remote,Compatible with all iPhone and most android phones, just switch the native camera app to video mode, click the button to start recording, click again to end recording. For Android Phones that you can't switch to video mode, please go the camera setting and set "Volume keys function" to "Record video", that way you can take video with the other button on remote. For Sony Xperia S, HTC One and X+ users, simply download the “Camera 360” app to use the remote. This shutter is the perfect solution to take photos and videos without having to hold your phone and tablet. There is no need to download apps for most devices. It will automatically pair with your phone or tablet that have blue tooth fuction. Widely Compatible Connected via Blue tooth, compatible with android 4.2.2 OS and up / apple iOS 6.0 and up, option to use in-built app or google camera 360 app. Works with almost all smartphones. Pocket Size & Wrist Strap Measuring just 1.97 x 1.18 in and smaller than a pack of gum, it can easily fit in your pocket take everywhere. And the adjustable wrist strap is the perfect accessory to attach to your keychain so you never miss a shot with your phone. Package Including: 4x Wireless Remote Control (Battery Included)