Unfortunately due to supplier shortages stock is now expected week commencing 28th Feb.
Radio Frequency  Battery Carbon Monoxide Detector WITH 10 YEAR LITHIUM BATTERY *Interconnect up to 20 wireless detectors *10yr Sealed Lithium Battery included *Battery only with integrated RF technology *Loud 85dB alarm *Insect proof *Test function and hush feature *Easy Installation with one screw *Compatible with Hispec Control Unit HSSA/CU/RF10-PRO