Useless in night mode due to incorrect battery capacity and charging cradle incorrectly constructed.

Anyone who wants to take his time 1-2h sleeping child here has a nice Babyfönchen. But if you want to monitor your child for a whole night should urgently stay away from this unit. The battery has a capacity of only 800mAh (2 * AAA instead of 4 * AA as a BM 500/550), holds so only about 5-6h. And then comes the kicker: It can not be used on the battery charger at the same time for charging and monitoring !!! After no more than 20-30 minutes, he begins to funny too loud beeping what to 02, especially at night: 00Hour is very annoying.
Tried with 3 different original batteries and also a second new replacement unit that came after I had complained about the first because I thought it was a device failure. Unfortunately, a system error!
Suitable for hospital or kindergarten but not for normal family.