For Huami Amazfit T-Rex 2 A2169 Portable Dual-sided Usable USB Charger Smart Watch Charging Dock
Dual-sided usable design, easy to charge your smart watch
Small in size and easy to carry, the USB port is plug and play
Devices with USB power supply function can be used, such as laptops, power banks, USB ports on sockets, etc.
Specification:

Output 5V 1A
Input: 5V 1A
Material: PVC
Compatible with:

Huami Amazfit T-Rex 2
Package included:

1 x Watch Charger
Accessory only, device not included