SanJie Wireless Door Open Chime Entrance Entry Alert Kit Digital Display for Business Home Store 3 Receiver 3 Magnetic Door Window Sensor 52 Ringtones 4 Volume Level(Black)

I got the 3-sensor/2-receiver version. When a sensor is triggered, the numeric display shows which sensor was triggered (001, 002, or 003 in this case). But it only displays the number for about 1 second, so if you don't look fast, you miss it. The sensors are assigned a number from the factory, but they aren't labeled, so you need to try each sensor to see which is #001, etc.You have the option to set a different ringtone chime for each sensor, which could be used to indicate which sensor was triggered. IMO, only 2 of the ringtones are suitable for commercial use (ding-dong type chimes); the rest are songs which I have no interest in. Frankly, they are very cheesy.Volume has a few settings. The lowest volume was still too loud for me, so I put a piece of tape over the speaker which solved the problem. The speaker faces the wall, so the tape isn't visible.When the receiver is plugged into a standard outlet, you can't plug a grounded (3-prong) cord into the other outlet--it doesn't fit, so you'll need to unplug the receiver if you need the outlet for vacuuming. Ungrounded (2-prong) cords fit fine. Seems like they could make the receivers smaller though.Double-chime: others have noted the ringtone plays 2 times each time the door is opened. I thought the same thing, but it turns out, that's just how the ring-tone is. It's not a single ding-dong; it's 2 ding-dongs, so it sounds like the chime is paying twice.Close door chime: as others have noted, the ringtone also chimes when the door closes. So each time a door is opened, the ringtone sounds when opened, and again when closed. Yes it's a bit annoying, but on the bright side, I hear every visitor.The manufacturer suggested pairing the sensors, but mine worked out of the box, so I did't need to.Batteries lasted about 3 months. I replaced with Energizer on 9/1/23. Will see if they last longer.

I'm not sure why, but the battery life does not sustain very long. My business door is always opening and the door sensor tends not to hold up very long (it die out very quickly for me). I just replaced it with a new battery after 1 and a half months, monitoring to see how long this new one would last. But overall it is OK.

After trying several different wireless doorbell systems, these by far had the best range and the volume was good enough to hear over the machinery in our production facility. Quite the selection of ringtones, too. If you’re looking for a wireless doorbell that is actuated when someone enters, you won’t be disappointed. The best part is that you can add more ringers for multiple rooms all actuated off of the same door trigger.

Received the unit and sensors work out of the box. The instructions for installing are pretty useless and don’t even make sense with the equipment I received.Upon installing and using, the unit “ding-dongs” twice every time the door opens and “ding -dongs” twice when the door closes. So it is pretty annoying and not at all what was expected.I thought it would ding-dong once when the door is open. Instead… it goes off so many times and is so annoying that I may need to remove altogether

In order to add more sensors, you will need to purchase a new system and pair the new devices.For example, if you want to add two sensors you will need to purchase a system with two sensors. You will recieve a receiver you may not want or need. I should be able to purchase just the devices I want to add.If I had known this, I could have purchased two systems that when combined together would have contained the numbe of relievers and sensors I wanted.Support from the seller with questions had to be submitted twice as the first question was deleted after 3 days.I cannot recommend this seller and definitely will not purchase from again.