5 x -140 DC-DC Boost Power Converter No more external multimeter required thanks to LCD display: the module can measure the voltage, current and even power at the output and display on the LCD Precise adjustment of power output and safe operation: separate trimmers allow the exact adjustment of voltage and current. The module is secured by reverse polarity protection at the input, overload protection and an anti-backflow diode at the output Versatile use: the power supply can be used for power supply, as a voltage limiter, as a charger, as a high-performance LED constant current driver module or for up/down control (step-up and step-down) of voltages with overcurrent protection. No need to add an anti-backflow diode when used as a charger, as the output is by the diode Colour:blue Material:plastic Package Contents: 5 x -140 DC-DC Boost Power Converter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.