This is the Interlock Launch Controller from AeroTech Consumer Aerospace. FEATURES: Emits a warning tone to alert spectators to a possible launch After firing the Key Eject system automatically disarms the firing circuit for the utmost in personal protection 40 feet of power cord Arming status display Flip-up cover with launch checklist Instruction sheet included INCLUDES: One Interlock Launch Controller REQUIRES: Assembly Phillips head screwdriver Pliers Liquid plastic cement 12 volt battery tlh 2/25/11