Features: Input voltage: DC3.6-30V, output voltage: DC3-30V, automatic step up/down converter module. Made of high-quality material, with nice durability, support short circuit protecting. Support positive and negative dual voltage output, stable and smooth. 20W low power consumption, stable performance, suitable for audio amplifiers. Delivery only includes a DC-DC boost buck voltage converter. Specifications: Input Voltage: 3.6-30V Output Voltage: 3-30V Max. Output Power: 20W Conversion Efficiency :69-88% Quiescent Current: 3mA Item Size: 60 * 34 * 15mm/ 2.4 * 1.3 * 0.6in Item Weight: 33g/ 1.2oz Note: 1. For a more stable voltage, it is recommended that the output current be greater than 15mA. 2. V- cannot be used alone, or can be used without voltage output. v+ can be used alone. Packing List: 1 * DC-DC Boost Buck Converter