Features: USB input 5V2A, CR2032 fake battery output 3V1A, can replace one CR2032 3V battery. Suitable for CR2032 3V power supply product, without frequent battery replacement, saving money and environmental protections. It can be powered by USB mobile power supply, USB charger, computer, etc. Red wire positive electrode, black wire negative electrode, easy to operate. 100cm cable length, small size, light weight, and easy to carry. Specifications: Material: Plastic Cable Length: Approx. 100cm/39.37inch/3.28ft USB Input: 5V2A CR2032 Dummy Battery Output: 3V1A Note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution. Package includes: 1 Piece USB to 3V CR2032 Dummy Battery Charging Cable