Linear ACT-31B MegaCode 1-Channel Block Coded Key Ring Transmitter, Black (Replaces ACT-21A)

Secure, reliable gate access starts with the Linear ACT-31B key ring transmitter. This 1-channel MegaCode keyfob transmitter delivers enterprise-grade security in a compact, handheld form—ideal for single-family, multi-tenant and commercial gate access needs. Each unit ships factory preprogrammed with one of over 1,000,000 unique codes, minimizing the risk of duplication and unauthorized entry. The ACT-31B includes a five-year lithium battery for dependable, low-maintenance operation and a built-in 10-second timeout to prevent accidental continuous transmission that can disrupt monitoring and surveillance systems.

Designed to integrate seamlessly with Linear access receivers and controllers, the ACT-31B offers straightforward setup and long-term reliability. Its rugged, pocket-friendly black housing (approx. 2.3" x 1.3" x 0.5") makes it convenient for everyday carry while standing up to real-world use. Whether you're managing a gated community, commercial facility, or critical infrastructure requiring strict access control, this transmitter combines ease-of-use with robust security. Upgrade your security and access control today—add the Linear ACT-31B to your gate accessories inventory for dependable entry management.

• Provides secure, hassle-free gate entry with MegaCode technology to virtually eliminate code duplication.
• Compact key ring design and rugged housing make daily use and long-term wear simple for residents and staff.
• Long-life lithium battery (up to 5 years) reduces maintenance and lowers total cost of ownership.
• Single-channel simplicity ensures easy programming and compatibility with all Linear MegaCode receivers and controllers.
• Built-in 10-second timeout prevents continuous transmission and protects your access control system from accidental lockouts.