ET-262 models are available without being affected by the Bluetooth communication method, so the smartphone model and OS version.
(Some Android tablets are not available, so the app installation is allowed.)

# ED-971 model eliminates the need to physically connect the phone to the (Bluetooth Low Energy) BLE technology available to customers the way you want
Possible support from Bluetooth 4.0 or later and is not supported in that earlier
Bluetooth 4.0 support is available from the Android kernel version 4.3 (Jelly Bean)