Applicable models: 

Charger A Compatible Devices:  Amazfit GTR 2, Amazfit GTS 2, Amazfit GTR 2e, Amazfit GTS 2e,  Amazfit GTS 2 mini, Amazfit GTS 4 mini, Amazfit GTR Mini, Amazfit Bip U, Amazfit Bip U Pro, Amazfit Bip 3 Pro, Amazfit Bip 3, Zepp E

Charger B Compatible Devices:  Amazfit T-Rex 2,Amazfit Cheetah, Amazfit Cheetah Pro, Amazfit GTS 4, Amazfit GTR 4, Amazfit GTS 3, Amazfit GTR 3, Amazfit GTR 3 Pro , Amazfit GTR 3 Pro Limited Edition