New Style Heddolf M330-1KB replaces the older M330-1K wireless keypad can have up to 60 individual 4-digit user codes and is ideal for gate or garage door openers that require more than one entry code. Wireless radio signal for the 10 on/off code switch type radio receivers by Multi-Code, Digi-Code, Linear, Heddolf and Multi-Code compatible on the 300MHz frequency.