Icstation DC-DC Adjustable Voltage Regulator DC Buck Converter 5-23V to 0-16.5V 3A Step Down Power Supply Module LCD Display Digital Voltmeter Ammeter with Shell Icstation digital DC-DC step down power supply module with terminal connector port easy to connect with other devices Dual voltage and currend LCD display, easier to recognise the output parameter Can be used as a normal step down power supply, battery charger and LED lgiht constant current drive module Input voltage: 5-23V, Output voltage: 0-16.5V, Module Size: 62 X 44 X 18mm/2.44 X 1.73 X 0.71inch (L*W*H) Fulfilled by Amazon usually spend 2-4 days to delivery, and if fulfilled by merchant usually need around 7 to 17 days to delivery. Please send us a message if you need a PDF instruction or meet any problem in using.