![RAPA=Relay-Activated-Phone-Activation; telephone ring sensing circuit with chime or light activation via relay closure | Channel Vision Low Voltage Structured Wiring, IP Intercoms, Audio Amplifiers Distribution, Crescendo & Abus Whole Home Audio RAPA=Relay-Activated-Phone-Activation; telephone ring sensing circuit with chime or light activation via relay closure | Channel Vision Low Voltage Structured Wiring, IP Intercoms, Audio Amplifiers Distribution, Crescendo & Abus Whole Home Audio](https://channelvision.com/wp-content/uploads/2012/06/ST-C5IDS.png)
RAPA=Relay-Activated-Phone-Activation; telephone ring sensing circuit with chime or light activation via relay closure | Channel Vision Low Voltage Structured Wiring, IP Intercoms, Audio Amplifiers Distribution, Crescendo & Abus Whole Home Audio
![K216+R503 Fingerprint Module Controller Car Ignition Control Ring Relay Capacitive Fingerprint Access Control Board - buy K216+R503 Fingerprint Module Controller Car Ignition Control Ring Relay Capacitive Fingerprint Access Control Board in Tashkent K216+R503 Fingerprint Module Controller Car Ignition Control Ring Relay Capacitive Fingerprint Access Control Board - buy K216+R503 Fingerprint Module Controller Car Ignition Control Ring Relay Capacitive Fingerprint Access Control Board in Tashkent](https://zoodmall.com/cdn-cgi/image/w=450,fit=contain,f=auto/http://luckyretail.com/Uploadfile/202007322/443098/443098.jpg)
K216+R503 Fingerprint Module Controller Car Ignition Control Ring Relay Capacitive Fingerprint Access Control Board - buy K216+R503 Fingerprint Module Controller Car Ignition Control Ring Relay Capacitive Fingerprint Access Control Board in Tashkent
![Grow K216+r503 Two-color Ring Indicator Light Relay Time 0.5s-20s Capacitive Fingerprint Access Control Board - Fingerprint Recognition Device - AliExpress Grow K216+r503 Two-color Ring Indicator Light Relay Time 0.5s-20s Capacitive Fingerprint Access Control Board - Fingerprint Recognition Device - AliExpress](https://ae01.alicdn.com/kf/H36ffd3e7f0fb4650bba7aeff1c6d143bQ/GROW-K216-R503-Two-Color-Ring-Indicator-Light-Relay-Time-0-5s-20s-Capacitive-Fingerprint-Access.jpg_Q90.jpg_.webp)
Grow K216+r503 Two-color Ring Indicator Light Relay Time 0.5s-20s Capacitive Fingerprint Access Control Board - Fingerprint Recognition Device - AliExpress
![Digital Programmable Time Relay Microcomputer Electronic Timer Switch Dc12v 24v Din Rail Mount Tp8a16 110v 220v Bell Ring Relay - Timers - AliExpress Digital Programmable Time Relay Microcomputer Electronic Timer Switch Dc12v 24v Din Rail Mount Tp8a16 110v 220v Bell Ring Relay - Timers - AliExpress](https://ae01.alicdn.com/kf/H50a044d1546643df8fba9ca754e83d03l/Digital-Programmable-Time-Relay-Microcomputer-Electronic-Timer-Switch-DC12V-24V-Din-Rail-Mount-tp8a16-110V-220V.jpg_Q90.jpg_.webp)