We have just acquired one of these as a 2nd monitor as baby #2 is nearly here and DD1 is still being a proper pest at bedtimes and we don't feel happy right yet not being able to hear her. I brought this 2nd hand cheapish as I didn't want bells and whistles, just something I could use to keep tabs on her at bedtimes. The only proviso being it needed to be digital so it doesn't interfere with the baby's monitor, and that it is portable as it needs to be used wherever we are downstairs (including the garden). We charged it up and started using it, but even after 24 hours on charge, the parent unit only lasts about 20-30 minutes which is useless. We then need to get the charger unit and plug it in wherever we are which defeats the whole point of it being a cordless unit. C Band Program Providers more. Javax Comm Usb Serial.