I can't get this to work. Have tried 3 brands of batteries. Have depressed the key as far as possible. Any suggestions?

Just a couple of ideas: 1. If you on use one pair of red and black leads, don't let the other two touch each other. 2. You may have to take the back off and adjust the metal clips that the key makes contact. Mine were slightly loose. 3. I know you said you pushed the key in, but it has to go very far in to make contact.

Can the PS II launch controller be used with small engines and rockets?

Oh yes, this is an excellent Heavy Duty launch controller good for any model rocket or Mid Power rocket.

Can this ignite 4 engines simultaneously?

Yes. It has two pairs of micro clips and colored wires (red = + / black = -), such that you can light-off two igniters with each pair of micro clips. The launch controller comes with a wiring diagram for doing clusters. This controller is much better than the smaller rinky-dink Estes controllers. Hope this helps. Happy flying!!

Is it tough? I am getting tired of launch controllers dying mid-launch with my classes.

I don't get many chances for launches, but I can say that this controller is good. It is far more reliable than the smaller controllers, because of the igniter current available from all the batteries.

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🚀 Ignite your launch game with precision and power!

DURABLE DESIGN - Crafted to handle rockets up to 1kg, ensuring your launches are as powerful as your ambitions.
PLUG PLAY POWER - Comes fully assembled—just add your own 6 C batteries and ignite your adventure instantly.
COMPACT PORTABLE - Lightweight and sleek at just 340g and under 20cm, perfect for on-the-go rocket enthusiasts.
BUILT FOR ALL AGES 10 - Safe and simple enough for young pros, yet reliable for seasoned hobbyists pushing limits.
EFFORTLESS CLUSTER LAUNCHES - Designed specifically for multi-engine rocket excitement, making every launch a showstopper.

The Estes PS II Launch Controller is a fully assembled, compact device engineered for cluster engine rocket launches. Powered by 6 C batteries (not included), it supports rockets up to 1kg and is suitable for users aged 10 and above, combining portability with reliable performance for hobbyists and aspiring rocketeers alike.

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Product Dimensions	19.3 x 10.92 x 4.32 cm; 340.19 g
Batteries	6 C batteries required.
Manufacturer recommended age	10 years and up
Item model number	2240
Manufacturer's Suggested Maximum Weight	1 Kilograms
Language:	English
Assembly Required	Yes
Batteries Required?	Yes
Batteries Included?	No
Color	Brown/a
ASIN	B00FU4AX44

EstesPS II Launch Controller

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