ITEM NAME:DC-DC Automatic Buck Boost Power Module Input 2.5-15V Output 3.3V Board A#S Product Description Description: DC-DC Automatic Buck Boost Power Supply Module Input 2.5-15V Output 3.3V Step Up Down Board Specification: Input voltage: 2.5-15V Output voltage: 3.3V Size: 18*13*4mm/0.7*0.51*0.15'' Note: Please allow 1-3cm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding. Included: 1 x DC DC Automatic Buck Boost Power Module.Included: 1 x DC DC Automatic Buck Boost Power Module. Due to the different display and different light, the picture may not show the actual color of the item. If item is defective after 3 months, you can still send it back to us.