Feature: 1. Work Mode 1: Input positive voltage and output positive and negative voltage. Positive and negative voltage should be used at the same time, otherwise negative pressure will not output. 2. Work Mode 2: Input positive voltage, output positive voltage, as a common buck boost converter. 3. PCB Board: The PCB board makes the module strong and durable, ensuring a better user experience and a long life span. 4. Wide Application: This power module is mainly used for car power supply, instrument power supply, LCD backlight power supply, etc. 5. Easy to Install: Comes with a compact size and a light weight as well, the easy installation can be quickly completed. Specification: Item Type: Dual Output Power Module Material: PCB Input DC: 3.6-30V Output DC ± 3-30V adjustable Maximum Output Power: 20W (output power is different under different conditions) Maximum Conversion Efficiency: 68 to 89% Static Working Current: 2.5mA. Package List: 1 x Dual Output Power Module