This is the worst intercom ever, not worth the excessive price.
Bought this kit about 3 years ago, but never got round to install it, since I've got time during the lockdown I've decided to upgrade my intercom system...opened the box, to find the unit inside the box is the 10" touch screen unit instead of the 7" mirror unit as per my order/box. Bargain, I received a better unit than the one I've paid for... but the 10" unit is dead (probably a return that was sent back and was mistakenly sent to me...(pity I've never opened the box till now)
I also bought the additional 7" inside unit, so I was still able to use the intercom system with only the additional screen.
After using this system for a week, I am ready to take it out and use my old intercom system again, this system is not worth the price, the quality and reliability of this system is very bad.
Rather invest in a proper HIkvision IP intercom if you are considering spending this much on an intercom system...