VTech DM7121 Audio Monitor

"5.0 out of 5 stars" - I use the VTech DM221 to monitor a 93-year-old with mobility and hearing disabilities, although he is generally still surprisingly agile and moves about the house between bedroom and bathroom. Using two sets of DM221 I can monitor both locations simultaneously and track him continuously when he moves about with hearing acuity approaching that of the cat which follows him around. The price point for these sets makes this a feasible approach. However, under the current technology configuration, monitors from different sets cannot be linked to the same parent unit unfortunately. Why? Having two parent units side by side presents no major problems however and, given the sensitivity of the monitors over a wide range, ensures continuous tracking within and between various locations.I found no issues at all with the range of transmission so I can take a parent unit with me into the yard or basement of the house without losing sound quality or sensitivity. The quality of the reception within the wide parameters claimed by the manufacturer is extremely good. You can literally hear a pin drop at any location/room and it is so sensitive that it sometimes picks up extraneous sounds from the adjacent street. At times I've heard that darn cat purring at a particular location when the animal must be at least 1.5-2.5 metres from the monitor. A person's normal breathing can easily be heard with monitor placed a minimum of 1m from the source. If these sounds become too much, just turn down the sensitivity on the monitor or the volume on the parent unit. VOX sensitivity level can be adjusted across 5 settings.Having a monitor that does not require the person being monitored to press buttons or even to speak (all sounds, normal and unusual, can be heard clearly) is a great comfort since a sudden stroke or accident may leave the monitored person unable to communicate verbally. With this monitor, allowing that you are attentive and able to interpret sudden and unusual changes in behaviour and patterns of sound, you will not miss a thing.I would have preferred to buy a 2-unit monitor set with a single parent unit to facilitate this configuration but only a 2-parent/single monitor set is available. Why? I normally cannot be in two places at once (although that feat is quite often necessary) and if I need to I can simply move the parent unit to a second location, with or without AC power connected. I can use the parent unit without AC on battery power which is sufficient to last at least overnight without AC power. (The monitor is permanently connected to power so no battery issues there. The parent unit should be connected to AC power most of the time to make sure the battery pack is fully charged and ready for mobile use). There must be different battery packs for different models to the DM221 or otherwise comments about lack of battery life on Amazon are just wrong. Australian customers must buy separate AC power plug adapters which are very cheaply and quickly available on Amazon AU.The units are compact, light-weight, durable plastic (although I wouldn't try a drop from a height) with fairly simple menu controls and the possibility to monitor sounds visually as well as aurally by observing LED sensors on the parent unit which register the strength of the source. The parent unit can be used to talk to the monitored person and, in my case, even if the deaf nonagenarian cannot determine exactly what is being said he does register the fact that you are there and attentive. The sound quality is so good that occasionally he understands simple messages such as "breakfast/dinner coming" and that is totally amazing given the quality of his remaining hearing capacity.There might be monitors on the market which could resolve a couple of the issues I've presented for my needs/configuration, but this product serves my purposes extremely well, most especially in terms of sensitivity to sounds on the monitor side and sound reception quality on the parent unit side.If your needs are similar, just buy it. It works perfectly well under Australian conditions.

"Doesn’t work" - The monitor worked once and then stopped working. The 2 units don’t even come on despite charging them for hours