Alarm.com ADC-AC-ET20 Single Gang Reader with Proximity, MIFARE DESFire, NFC and Bluetooth Low Energy

Enable secure, flexible access control across offices and facilities with the Alarm.com ADC-AC-ET20 single-gang smart reader. Built for businesses that need seamless credential migration, the ET20 accepts legacy proximity as well as encrypted MIFARE DESFire EV1/EV2 credentials while also supporting NFC and Bluetooth Low Energy mobile credentials for badge-less entry. With OSDP Secure Channel and remote firmware upgradability, the reader helps maintain strong physical security and reduces onsite maintenance. Its IP55 rating and tamper-detect accelerometer make it suitable for both indoor and outdoor doorways, while tri-state LEDs and an audible beeper speed user adoption and reduce entry errors. Installers appreciate the Wiegand/OSDP auto-detect interfaces that simplify integration into existing access control systems and monitoring platforms. Ideal for corporate offices, multi-tenant buildings and education campuses that prioritize security, surveillance and streamlined credential management. Add the Alarm.com ET20 to your security infrastructure to modernize access control—contact your Alarm.com dealer to specify it for your next deployment.

• Simplify credential management with one reader that supports proximity, MIFARE DESFire (EV1/EV2), NFC and BLE mobile credentials for seamless onboarding and fewer lost-badge incidents
• Future-ready security: OSDP Secure Channel and encrypted DESFire support protect access points and integrate with modern access control monitoring
• Easy upgrade path: Supports legacy FSK/ASK proximity plus LEAF and EV2 smart credentials to protect your investments during transitions
• Robust, single-gang form factor rated IP55 for indoor/outdoor deployment and a tamper-detect accelerometer to reduce vandalism downtime
• Clear user feedback with tri-state LED and beeper for fast, intuitive door entry and reduced occupant confusion
• Flexible integration via Wiegand and OSDP auto-detect for faster installations and interoperability with existing security systems