This original Oppo VOOC microUSB cable is capable of charging at 5V @ 4A, best used with an original Oppo charger, it’s specifically designed for Oppo devices.
What is VOOC?
The OPPO VOOC (Voltage Open Loop Multi-step Constant-Current Charging) Flash Charging system is a proprietary rapid-charge technology created by OPPO Electronics. In contrast to USB Power Delivery and Qualcomm Quick Charge technology, which increases the voltage during fast charging, VOOC uses a higher current than normal USB 2.0 charging; VOOC operates at 5 volts and 4 amperes. The VOOC Flash Charge circuit technology reportedly lowers the temperature of the charging adapter, and creates an interface from the adapter to the phone, which, OPPO claims, improves the speed and safety of the charge.
OPPO also licenses its technology to OnePlus and Vivo through another brand of its holding company BBK Electronics. VOOC 2.0 has been licensed to OnePlus as the Dash Charge technology.