What kind of batteries does the booster take?

If your handy with simple electronics you can get like a charger. I used the one for my old braun electric shaver. Just cut off the end that attaches to the shaver. Buy some alligator clamps like at lowes and attach the positive and negative cables to the clamps. Then just clamps negative to where the negative side of the battery would go.then same for positive. Or unscrews the botton and attach each lead to the motor. I did it and works fine. Kept using batteries for my nephew. Recently i took built in motor for an air mattress air pump. I had to modify everything but pretty fun. It kinda overpowered now launching car had to have a tunner on the exit because they catch air but the tunnel took care of that.

Is this powerful enough to launch it through the infinity loop?

No. It’s great to regain speed with a long stretch of track but it will not work with the infinity loop (we have one )

How do you select either of the two speeds mentioned in the description?

Hi Jon, Unfortunately, there is only on or off. The listing description is not entirely accurate. It is a different version of the booster that has two speeds. I have submitted for it to be changed but since many sellers contribute to the listing description it is not guaranteed to be corrected. It does offer a high-speed boost, I have seen some comments offering it is not a fast boost - I think in that scenario it is the width of the car that is not allowing it to be "boosted" enough. My grandson and I use these boosters quite a bit and find they give a car enough of a boost to make a full loop, some even two. I would also recommend using quality batteries. Thanks!

ASIN	B07CGKZSCF
Age Range Description	6 years and up
Assembly Time	1 Hours
Base Material	TPR
Battery Description	Alkaline
Best Sellers Rank	#41,499 in Toys ( See Top 100 in Toys ) #71 in Slot Car Race Tracks
Brand Name	Hot Wheels
CPSIA Cautionary Statement	Choking Hazard - Small Parts, No Warning Applicable
Collection Name	Toys & Games or Toy Vehicles
Color	Multicolor
Compatibility Options	Sets & Accessories Hot Wheels
Control Method	Touch
Controller Type	touch control
Customer Reviews	4.6 out of 5 stars 7,210 Reviews
Educational Objective	Problem Solving Skill
Frame Material Type	Plastic
Global Trade Identification Number	00887961719963
Included Components	Vehicle
Includes Rechargeable Battery	No
Is Assembly Required	No
Is Electric	Yes
Item Dimensions	8 x 15 x 13 centimeters
Item Shape	rectangular prism
Item Type Name	Track Builder Booster Pack Playset
Item Weight	0.49 Kilograms
Item height	13 centimeters
Manufacturer	Mattel
Manufacturer Maximum Age (MONTHS)	120
Manufacturer Minimum Age (MONTHS)	72.0
Material Type	TPR
Model Name	Booster Pack Playset
Model Number	GBN81
Model Year	2018
Not for Kids	No
Number of Batteries	2 D batteries required.
Number of Pieces	4
Number of Players	1
Occasion	Birthday, Children's Day
Other Special Features of the Product	Competition All-Inclusive Touch Activator
Outer Material	Plastic
Pattern	Single
Power Plug Type	No Plug
Power Source	Battery Powered
Product Style	Track Builder Booster Pack Playset
Remote Included	No
Scale	1:64
Size	One Size
Skill Level	Beginner
Theme	Cars
UPC	887961719963
Unit Count	1.0 Count

Hot Wheels Track Builder Booster Pack Playset, Multicolor (GBN81)

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