This charger compatible with Amazfit T-Rex, GTR, GTS smart watch. ---(Not compatible with Amazfit T-Rex Pro, GTS 2 Mini, GTS 2e, GTS 2, GTR 2, GTR 2e, GTR 3, GTS 3)The charging cable provides a charging speed, about 2.5 hours a full charge. Note: please use the recommend USB adapter (5V/1A)For models:Huami Amazfit Happy Duck Children's Watch Huami Amazfit GTR Huami Amazfit T-Rex Huami Amazfit GTS Commpatible Watches:Commpatible with Amazfit T-RexCommpatible with Amazfit GTSCommpatible with Amazfit GTRThe Charger built-in over-voltage protection, over-current protection, short-circuit protection. Provides stable and safe charging for your smart watch.With a replacement charger cable will make your smart watch charged more convenient when you are at home, in office or on travel.Your Smartwatch Device will No More "Dead" again. You can charge it at home, in office, in car or on travel. Make your charging become more convenient and safe;Made from durable PC material and soft ABS plastic, long lasting and avoid scratching, the smooth polished surface protects the device from rubbing with added fashion;Built-in Voltage Regulator prevents your device from being damaged by over current overcurrent when connected to USB power source. Work with DC adapters also;Power protection circuit included, easy installation with proper mounted pins ensures enhanced faster charging speed.