Fail-Safe, Micro: Fu/JR/Air/Hi COMPACT FAIL SAFENumber: OFN 91002 MICRO FAIL SAFE fits in all radio boxes SUPER SMALL SIZE, UNIVERSAL PLUGS, WORKS WITH MOST RADIOS Extended Product Information: Ofna's micro fail-safe is all you need to protect your nitro car or truck from running away out of your control. It's super small size, about as big around as a nickle, allows it to be mounted easily in any nitro vehicle. Just plug it into your receiver and