Key Chain,Kwok Portable Power Bank 18650 External Backup Battery Charger With Key Chain (Blue) Key Chain-New rechargeable battery, no memory, more than 500 circle time. Built with IC chip to protect your devices from short circuit, overcharge. Key Chain-Compatible with: USB charging mobile phones and electronic devices. Key Chain-Equip with strap, easy to carry. Key Chain- Charger only, battery not included. Key Chain- Note: please leave us a note on paypal to specify color when you make payment, otherwise we will send random color to you.