FireAngel Optical Smoke Alarm with Escape Light & 3 Year Replaceable Batteries, FA6611-R (ST-623E replacement, new gen) , White : Amazon.co.uk: DIY & Tools
FireAngel Optical Smoke Alarm with 10 Year Sealed For Life Battery, FA6620-R (ST-622 / ST-620 replacement, new gen) , White : Amazon.co.uk: DIY & Tools
FireAngel Optical Smoke Alarm with 10 Year Sealed For Life Battery, FA6620-R (ST-622 / ST-620 replacement, new gen) , White : Amazon.co.uk: DIY & Tools