Home / Workplace Safety / Personal Attack / Quantec Attack Alarm Product Description RF Integrity 'Heartbeat' Transmitter Part No. QT421 Condition New The QT421 Monitored RF Integrity Transmitter is intended for use with Quantec's QT422RX Radio Receivers. Helps ensure RF integrity and site coverage at all times by sending a periodic RF test transmission to Receivers with the same RF group address. Flags a fault at the Quantec Controller if a transmission is not received. Typically located at strategic points on the installation - we recommend at least one RF Integrity Transmitter is used per Radio Receiver. Mountable on a 25mm UK single gang back box. Takes its power from the Quantec network but is not an addressable device as it is monitored by the radio receiver(s) it is set to work with. Specifications MPN QT421 Brand QUANTEC Product Code QT421 Customer reviews No reviews left yet Write A Review Sort byMost RecentTop Rated Delivery & Returns Free UK Delivery over £250Returns Policy: The company operates a 14 day returns policy, products returned in an unopened / undamaged condition will be refunded. Customer Reviews QT421 RF Integrity 'Heartbeat' Transmitter Product Code QT421 £119.47 £143.36 (inc. VAT) Login to add this product to your wishlist.