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This review is from: BT 250 Digital Baby Monitor (Baby Product)
We previously owned a BT150 monitor and were very happy with it. When we needed a new one we bought this one as an obvious upgrade, however have been very disappointed with it - the BT150 is far superior in our opinion.
Inaccurate - BT250 reads 2 degrees higher than our BT150 and our house themostat - would assume the BT250 is thus inaccurate.
Temperatue range fixed - the BT250 is hard set on temperatures which are "too hot" - irrespective of where you are or what you've put your baby down wearing. The BT150 allowed this to be configured based on where you are/what your baby is wearing. For example, we're in Spain at the moment and the monitor is constantly alerting the temperature even though our son is just down in a baby-grow due to the warmer weather.
Sensitivity range fixed - the BT250 has a hard set on sensitivity whereas the BT150 allowed you to select a sensitivity. With the BT150 we used to set the sensitivity to just over "breathing level" which allowed us to hear if he was tossing and turning. With the BT250 you either get everything (breathing, etc.) or nothing but crying/loud noise (on the "low mute").
Batteries get hot & don't last as long - two issues with the BT250 batteries: the first is that they constantly charge when the monitor is in it's cradle and get really hot by morning, and the other is that they seem to have less battery life when fully charged (or the BT250 uses more power to run)
All in all, if you have had a BT150, don't upgrade to the BT250 and if you're looking for a new monitor after owning a BT150 we'd suggest you look at other units first.