Features The constant voltage and constant current programmable control power supply module put the collection of analog integration and digital control functions in one. This module has power-down stored function and can store 10 groups preset value. Compared with the traditional analog power supply, it is more convenient to quickly extract the voltage or current required. LCD display on the module has the function digital voltmeter and ammeter. On the setting data interface, you can adjust over-voltage value, over-current value, over-power value, data set and LCD brightness Note: 1.This is DPS3005 /DPS5005 communication version, there is a communication interface on the back. 2.USB + Bluetooth means: DPS3005/DPS5005+ USB communication board+ Bluetooth communication Board A: We have the file for upper computer installation and software, you can contact us. B: Upper computer installation, connection by USB and Bluetooth video: you can go to RD tech channel to check 3.DPS3005 /DPS5005 have same functions, only the technical parameters are different,for example, voltage, current ,etc. Very important: 1.Before buying this product, please download the upper computer software and test, if it fits your computer , you can buy 2. the upper computer only support For Win7 and above   Connection description IN+: Input positive, IN-: Input negative: OUT+: Output positive,  OUT-: Output negative Note: Input voltage range is DC 6-40V and 40v is the limit voltage; please leave a room to use. Or else it will be burnt. The input must be DC power supply, not AC 220V, or else it will be burnt too. Though this module has reverse connection protection and output short circuit protection, you can muse be in strict accordance with connection description to connect. If you connect the supply power with output, the module will be burnt.   Package list: 1 x Step-Down Module 1 x blueteeth board 1 x USB board 1 x communication cable       Package List