Substitute for Linear ACT21 Megacode 1-button 318 mhz keychain Garage Door Opener Remote Control [375UT-2button]

ACT21 keychain remote in Megacode format operates at 318 MHz with smart coding—no dip switches required. This 1-button transmitter measures 2" by 1" and works with gate and garage door openers. Compatible with all Linear Megacode System products. Includes key ring. Uses 3V lithium button cell batteries.