The ESP CSD-2 is a combined optical smoke and fixed heat detector manufactured to complement the ESP Mag Panels. 
The unit comes complete with a diode base and is fully compliant with CPR and approved to EN54 standards. 
Technical specifications of the CSD-2 are: 
Operating voltage – 9-30 VDC 
Class – A1R
Wire gauge – 0.4mm – 2.0mm Twin 
Operating temperature - -10°C to 60°C
Test facility – Simulated smoke / heat 
Approval – EN54-7 & EN54-5