DROK Mini Electrical Power Converter 8-20V 12V to 5V Auto Voltage Buck Transformer Board Step-down DC Volt Regulator with 5 Pins Mini USB Adapter Connector Plug Dual Output Adopts synchronous rectification technology and is low heating generator With over-current, over-heating and short-circuit protection, hence safe to use The module is full glue, waterproof, anti-moist and anti-shock Low power consumption of 10 to 12MA when in empty load and high transfer efficiency of 96% Two wires(red wire and black wire) for easy wiring connection