Please note that the BP3L device does not completely turn off. Instead, it uses the Bluetooth Low Energy (BLE) technology to ensure that the device is always discoverable. It does not connect with your phone/tablet via Wi-Fi and cannot be found in the Bluetooth settings of your smartphone/tablet. The green light indicates that the device is connected with the MyVitals app on your phone/tablet and is ready to use. To put the BP3L to sleep, completely close the MyVitals app and the green light should turn off.