Features:
1. Compatible with Microsoft Surface Pro 3 and Microsoft Surface Pro 4 Intel Core i5 i7 tablet Only. Not suitable for Surface PRO 4 Intel Core M3.
2. High speed charge， Tinned copper， Electromagnetic Immunity.
3. Short circuit protection， over-voltage protection.
4. It is portable for to to connect to mobile power supply.
5. Interface: 5.5mm (outer diameter)*2.1mm (inter diameter).
6. Its not USB port cable， it only compatible for power bank which can use to charge laptop only.