Color: Black - High temperature resistant cover and Copper pins - Size: Hole DIameter: 5.5mm, Pin Diameter: 2.1mm - Female DIP type - Suitable for 2.1mm Jack 3 Pin Contact
Features:
* Specially designed for wireless BT earphones, earbuds and headphones with Micro USB ports.
* 300mAh capacity power bank can charge your wireless BT earphones for 5 times.
* Made of high-quality plastic material, durable and shock-proof.
* Mini size and lightweight design make it portable to carry.
* Built-in smart chip automatically matches the rated voltage and current of the earphones without harm.