Color: As shown in the First image. Quantity and size : As shown in the title or description. Dc Step Down Module Power Supply Dc Buck Converter, Step-up Converter Features: It is a DC Constant Voltage Constant Current Step Down Power Supply Module It Can Be Used As Ordinary Buck Power Supply Module, Charger and LED Constant Current Driver Simple and Efficient, Practical High Input Voltage Stable Voltage Output Support over Temperature Protection Support Overvoltage Protection Support Short Circuit Protection Low Power Consumption Support Constant Voltage Constant Current Output Support Charging Function With Heat Sink and Keep Good Heat Dissipation Features: Product Name:DC Step Down Power Supply Module Working Voltage:DC 16V-90V, DC16-120V, DC9-90V, DC9-120V Output Voltage:DC5V, 12V Output Current:3A Output Power:5V-15W, 12V-36W Conversion Efficiency:About 96% Working Frequency:140KHz Soft Starter:Yes(Failure at High Power Load) Over Temperature Protection:Yes Overvoltage Protection:Yes Short Circuit Protection:Yes Working Temperature Range:-40~85 Working Humidity Range:0%-95%RH Size:42*30*17mm/42*30*20mm