No, you only need the skyBeacon app for configuration and tuning. The app is no longer required after configuration is complete.
Yes, the position lights need to remain switched on during all operations. Removing power from the position lights also removes power from skyBeacon and/or tailBeacon. According to 91.225(f) “Each person operating an aircraft equipped with ADS-B Out must operate this equipment in the transmit mode at all times.”
The certified skyBeacon and tailBeacon feature a unique password secured configuration interface via Wi-Fi. A user must enter the password to change the device configuration including the aircraft ICAO and callsign. The password is unique to the device, and once configured, cannot be reconfigured for another aircraft without that password. The password is essentially an [...]
A skyBeacon/tailBeacon can legally be used to enter and exit United States airspace. Pilots must also be familiar with and comply with the destination country's ADS-B rules if applicable. At this time Canada, Mexico, and the Bahamas do not have any ADS-B requirements for light aircraft.