Funny enough, our daughters around that age walk about that distance to/from school regularly. We use a pair of walkie talkies [1] to comm, and they work shocki

Funny enough, our daughters around that age walk about that distance to/from school regularly. We use a pair of walkie talkies [1] to comm, and they work shockingly well over that entire distance. 1: Pofung BF-T15. Two pack was $17 on Amazon at the time. Baofeng is an adjacent brand.