Yes, you can transfer ownership of your device.
First you must unregister your device from your account.
To unregister you Xensr Air you must follow these steps:
1. Connect your Xensr Air to your phone via Bluetooth.
2. Open the Xensr App and tap the settings tab.
3. Tap the Device ID to open the Device properties.
4. Tap "Forget this Device" to unregister your Xensr Air.