GEREE 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 The module is Female USB port + Male mini usb plug , full glue, waterproof, anti-moist and anti-shock (for USB and Mini USB charging ports , can't be used for iphone). Input voltage: 8V-22V ; Output Voltage: 5V ,1A. MAX 3A. With over-current, over-heating and short-circuit protection, safe and reliable. Low power consumption of 10 to 12MA when in empty load and high transfer efficiency of 90% GEREE 12V Step-down Converter --30-Day Money Back Guarantee -- 12 Month Replacement Warranty -- Lifetime Support Guarantee