The Seco-Larm Enforcer 2-Button RF Transmitter, 3-Channel is a fixed code transmitter that operates on the 315 MHz frequency. The transmitter is used to control the Seco-Larm Enforcer 2-Channel RF Receiver (SK-910RB2Q, sold separately). Enhanced Security with CODEBUMP: With Seco-Larm's CODEBUMP technology, so-called codegrabbers and scanners are rendered obsolete because the RF code changes every time the transmitter button is pressed. In addition, with billions of possible codes, the chances of ever repeating a code are virtually nonexistent. Seco-Larm's CODEBUMP transmitters and receivers are perfect for controlling garage and gate openers, car alarms, home alarms and more. FEATURES: Fixed code format with billions of possible codes. Wireless range up to 500 feet (150m). Flashing LED indicator confirms transmission. Includes keychain ring and battery. CONTENTS: RF Transmitter, Keychain Ring, 12VDC Alkaline Battery. CONFIGURATION: Uncoded.