Which devices is the MMC app compatible with?
Any phone that supports Bluetooth Low Energy (BLE), such as:
iPhone 4S, iPhone 5/5C/5S, iPad (3rd gen & 4th gen), iPad Mini (Apple devices require iOS 5 or later)
HTC One, One X+, Droid DNA, Samsung Galaxy Nexus, Galaxy SIII, Galaxy S4, Note II.
Is there a safety/security concern regarding accidental ignitions?
As far as malicious/accidental launches from interference or other phones, it will protect against that. BLE has encrypted PKI authentication. The app will let you set an identifier for your phone.
The key safety mechanism overall is that you don’t plug the firing cable in till you’re ready to launch. There is a master switch as well on the case in addition to an LCD indicating status of the system. Ultimately there is always a chance that the hardware or firmware will fail. The only completely reliable safety is the lack of connectivity (physical cable going to the igniter being disconnected).
Keep in mind that the current leading model rocket launchers do not have this as a safety feature (the removable launch cable). While the key-in-launcher system is perfectly safe in practice, with our version you can plainly SEE that the thing is disconnected and can’t fire. That beats a child holding the launcher isn’t jamming something into the keyhole. We feel our system can be more secure if used properly.