The RF-BW-T interlink base, it’s quick to install and quick to link ensuring greater productivity and savings. The base unit has been designed to transmit an RF signal, when the alarm attached to it senses fire or CO. When another RF base receives this signal the attached alarm will also sound, eliminating the need for connection wires between each alarm.- Wirelessly interlink up to 50 SW1-PF-T smoke , HW1-PF-T heat and CW1-PF-T CO alarms- Quick to install and link – ensuring greater productivity and savings- Push-Fit docking base system- Compatible with SW1-PF-T (Smoke), HW1-PF-T (Heat) and CW1-PF-T (CO)- 5 Year Warranty- 10 Year Lithium Battery