Large Scale Safety Kill Switch Features: Kills your 2-cycle gas engine on command, loss of radio signal, low battery, or total battery power loss Comes ready to install - no soldering required Optically Coupled to isolate your ignition system from your radio system Built-in LED for easy-to-spot operational status 3-Channel Radio System Required Not Compatible with AVC-Equipped Receivers This is a replacement part for the following Losi and Pro Boat models: 1/5 5IVE-T 2.0 4WD Short Course Truck Gas BND (Losi - LOS05014) 1/5 5IVE-T 2.0 V2 4X4 BND Gas Short Course Truck (Losi - LOS05014V2) 1/5 5IVE-T 4WD SCT Gas RTR with AVC (Losi - LOS05002) 1/5 DBXL 2.0 4X4 RTR Gas Desert Buggy (Losi - LOS05008) 1/5 K&N DBXL 4WD Buggy Gas RTR (Losi - LOS05010) 1/5 Monster Truck XL 4WD RTR with AVC (Losi - LOS05009) Zelos G 48" Gas Powered Catamaran RTR (Pro Boat - PRB09004) Zelos G 48" Gas Powered Catamaran RTR (Pro Boat - PRB09004V2)