Jefftron company was founded in 2011 as a manufacturer electronic devices for airsoft electric guns.
The most advanced devices are Leviathan mosfets with Bluetooth communication.
It adds new shooting modes, controls RoF, pre-cocking, active braking, low battery indication, statistics...
User controls everything via application in the smart phone (iOS and Android).
Leviathans are fully integrated inside the gearbox version instead of the original trigger contacts.
These devices are made in Czech republic.