I am about to go camping for the first time with my 6 month old little girl. She has just started to sleep through but doesn't do it reliably. We're going with about 30 friends so I would really like to avoid going to bed at 8:30pm with her! Has anybody got any recommendations for a babymonitor that can operate on batteries (tho we will have access to mains to charge during the day), has a long range, and has flashy lights to alert when the little darling pipes up? Thx!