This downlight can be used instead of any standard downlight standard 65mm cut out size and allows you to get sound in the room by connecting to any bluetooth device eg iPhone iPad Tablet etc.. The speaker is built into the downlight. There is no specialist speaker cable or wiring needed, just connect it to the mains. No need to download an APP, just connect by via Bluetooth and play any music from the device eg iTunes, Spotify, Youtube anything! Ideal for new installations, or why not take out one of your existing downlights and simply connect this one in Great for kitchens, bathrooms away from shower head, bedrooms, lounges Power: 5W light source, 3W speaker Voltage: AC220-240V 50/60Hz - Direct to Mains CCT: 4000K Natural White Colour Temperature Lumens: 400lm Size: 84x86mm Cut-out: 65mm