*Powered by AAor external battery.*Learning code with receiver,Fixed code with transmitter.*Range:200-250m.*With ON/OFF switch safeguard.*Output power:12v.*Auto-testing.*Output power indicator.*With"Single","All"and fixed time" Sequencer"firing functions.*By using our professional radio control desk-KFE2209,it can control at least 40pieces of receivers independently,This makes the unit perfect for difficult shoot sites for smaller shows,special effects,family shows and wedding displays.