XUEMEI School Science Project: This product is a DIY kit, not the finished product Its soldering project requires some basic electronic theoretical knowledge and welding and practical ability. Features: Hourly function 12H/24H time display mode. Light control function Parameters: DC 5V; comes with a USB power supply, connect the USB charger to use it. Note: CR1220/CR1216 batteries are NOT included. Product Description With this digital talking clock DIY kit, you can make a stylish clock yourself. With a transparent case, the components can be well protected and the clock looks stylish. Features: Digital talking clock DIY kit for electronics enthusiasts. With a transparent case, components can be well protected and the clock looks stylish. Automatically display time, temperature, date, and day. C/F selectable for temperature, 12H/24H time display mode. Large 4-digit LED display, can show you the time clearly. Light control, the clock will automatically brighten during the day than at night. Useful alarm function and hourly chime function. Warm white night light function by long pressing the voice button. With a power supply, it is convenient for power supply. Display Modes: 1. Time/temperature/date/week are automatically displayed circularly. 2. Time/temperature are automatically displayed circularly. 3. Display only the time. Specifications: Display: Four-digit LED Display Color: Blue Power Supply: DC 5V; 1 * CR1220 button battery for (NOT included) Case: 11 * 4.5 * 3 cm / 4.33 * 1.77 * 1.2 inches PCB Size: 9.5 * 3.5 cm / 3.7 * 1.4 inches Note: The button battery is only used to memorize the time when it is powered off, not to power the clock (use DC 5V). The display color may be slightly different in the picture due to the lighting effect, please in kind prevail Package List: 1 * Digital Talking Clock Kit Safety Warning Note: PCB does not need to solder circuit holes;