RT628 easy to operate for kids and it is the best gifts for kids, it is also the great tool for parents to communicate with the kidsIf you think it is difficult to setting for little kids, you can lock the keypad,and then the kids will not change the Channel,just need to press the PTT to talk.Specification: UHF: 462.550-467.7125MHzChannels: 22 FRS and GMRSVOX functionChannel lockLCD display includingbattery status indicatorTransmitting and receiving iconsChannel number and scan statusMonitor functionSetting the double channel monitorScanning ChannelsPower selection (LO/HI)Push to Talk Timeout TimerSetting and Transmitting Call TonesSetting the Sensitivity LevelSetting the SQUELCH Level 1-6Finding Channels and Channel lockpower with 3 AA batteries(not includes).A PTT button lets you communicate with your partner.And wireless communication range up to 8000 feet depending on environment and terrainUsing Retevis RT628 to communicate with your friends or your children to know what are they doing.It is great for the yard,or the house or anywhere you want to keep in touch while playing.The extensive listening range makes it great for outdoor play and perfect for your next adventure.What is in box: 2× Retevis Walkie Talkies 1× English user manual Don't need license,it is legal in US. Whether how many Retevis RT628 Walkie Talkies, it will work as long as the walkie talkies on the same channel.