Radio-Interlinked 10 Year Sealed Battery Optical Smoke Alarm - UltraFire ULLS10RF - From £29.39 inc VAT
Ei146RC Optical Smoke Alarm • EI Electronics
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