The easy and safe way to launch model rockets. The Estes 2220 Electron Beam Model Rocket Launch Controller has 15' leads with alligator clips, a tethered safety key to prevent accidental launches and a warning light to test system for continuity. Requires 4 AA 1.5V batteries (sold separately). Launch Controller colors may vary from photo. ATTENTION: Residents of California, New Jersey, Rhode Island and North Dakota please review the Terms of Sale for state specific restrictions on model rockets. ATTENTION: Estes products may contain chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.