Retevis H-777 Walkie Talkies Rechargeable Long Range Led Flashlight Emergency 16CH Hand Free Two Way Radio for Adults… Price: $55.99 (as of 18/09/2020 01:07 PST- Details)

Each work group can have their own channel to minimize disruptions in other departments
180g weight is light and small; the radio is easy to carry and hang on everywhere you want
Low power alert will remind you and intelligent charging will save the battery life