Most of the caravanners don’t travel without two gas bottles. With SmartSense premium, you could monitor gas bottle level on both of them, via a single app. SmartSense gas bottle level sensors are compatible with Odyssey and JHub apps, which allow connecting and monitoring up to two devices, which is just perfect for serious travelers! Alternatively, you could use a standalone SmartSense app, also available to download free of charge. The SmartSense sensor has a standard non-rechargeable replaceable 3 Volt round battery CR2032. SmartSense app works on all devices that have Bluetooth 4.0 + Low Energy (BLE).