4 COBRA MicroTalk CX101A 16-Mile 22-Channel GMRS FRS 2-Way Walkie Talkie Radios
These work really well. We had a set before and lost them on a move. Rugged enough for the kids to use, very good range, we've never had a problem with not being able to hear one another.  Wish they could be charged instead of battery operated only and that they had a plug for headphones..my only complaints!