The two devices connect directly together. I'm not a great distance in the house, so not tested the 175 meters but it works very well in all my house. I guess it must be convenient for story houses or for people who have a large garden with an electric gate (not test either the electric opening as posed next to a normal door).
The interior intercom can be attached to screw or not, it has removable legs (all starts and comes off easily). It is discreet and elegant. The screen is large enough. One person can very well do without enable sounds but it turns on automatically if it is the case. In case of alarm, the camera automatically takes a picture (which allows you to see which passed in his absence). The phone key will contact the person that sounds but then not to have both intercoms too close together because there is a feedback. There are 16 ringtones in any one makes woof, woof which made us laugh. Too bad it makes little dog, sometimes a burglar rings the door lol.
Curiously, the image is clean but the colors are dull or sometimes in shades of gray. Probably depending on the quality of the connection in any case it is clear.
Both have a battery so you can get inside intercom disconnected. By cons must be taken to an outside intercom to charge the battery (low battery alarm) so it's a bit special, no way to connect it to 240v. Sometimes we are tempted, with the domino.
Overall, it's still a very good solution quality wireless intercom. the device is guaranteed for 3 years. Both devices have the beefy air.
