*Powered by rechargeable Lithium battery.*Learning code with receiver,Fixed code with transmitter.*Sleeping and awaking power-saving.*Intelligent battery protection at low voltag.*Range:200-250m.*With ON/OFF switch safeguard.*Auto-testing.*Output power:24v.*Output power indicator.*With""Single","All",Step","Sequencer".*By using our professional radio contrlo desk-KFE2209/18,it can control at least 12pieces of receivers independently. t Can control at least 12pieces of receivers indenpendently.t can be used for big shows.