You are buying BOTH of the boosters that you see. They are both working. One battery door is broken, but it sort of "sits" in place just fine.
Mattel Hot Wheels Track Builder Straight Track 4 Feet Orange Plastic 120cm New
Vintage Mattel Hot Wheels Track Purple Connectors (Lot Of 5) 4" Track Connectors
2 pcs Genuine MATTEL Hot Wheels Track C-Clamp - Red - 3 Track Connection Points
MATTEL HOT WHEELS TRACK BUILDER PARTS BUNDLE REPLACEMENT PARTS PLUS NEW CARS
Mattel Hot Wheels Track Power Booster 2018 Gray Red Motorized Launcher Tested
2017 Mattel Hot Wheels Track Power Booster Car Launcher Orange FLK92 TESTED
