Get 5 x -140 DC-DC Boost ConverterNo more external multimeter required thanks to LCD display: the module can measure the voltage, current and even at the output and display on the LCDPrecise adjustment of 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 outputVersatile : the supply can be used for supply, as a voltage limiter, as a charger, as a high-performance LED constant current driver module or for up/ control (step-up and step-) of voltages with overcurrent protection. No need to an anti-backflow diode when used as a charger, as the output is by the diodeColour:blueMaterial:plasticPackage Contents:5 x -140 DC-DC Boost ConverterOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.