Catalog > Consumer Electronics > Security & Alarms > Alarms > Alarm Systems Sentry GSM Program Module GSM Program Module MEGSM-PM GSM Program Module 181.94 ZAR inc for 1 Each 1 in Stock Add Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Specifications RX connected to RX TX connected to TX 3V connected to 3V CLK connected to CLK NOTE : Tighten the screws on the terminals to ensure a good electrical connection.