XUEMEI School Science Project: This product is DIY kits, not the end product His Soldering Project requires certain foundation of basic electronic theoretical knowledge and welding and hands-on ability. Functions : Hourly Chime Function12H/24H time display mode. Light Control Fonction Parameters: DC 5V; come along with a USB power cable, plug in the USB charger to use it. Note:CR1220/CR1216 batteries are NOT included. Product With this digital talking clock DIY kit, you can make a nice clock by yourself. With transparent case, components can be well protected and the clock looks stylish. Features: Digital talking clock DIY kit for electronics enthusiasts. With 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 be brighter during the day than during the night. Useful alarm function and hourly chime function. Warm white nightlight function by long-press the voice key. With a power cable, it is convenient for clock power supply. Display Modes: 1. Time/temperature/date/week automatically display circularly. 2. Time/temperature automatically display circularly. 3. Only display the time. Specifications: Display: 4-digit LED Display Color: Blue Power Supply: DC 5V; 1 * CR1220 Button Battery for (NOT included) Case Size: 11 * 4.5 * 3cm / 4.33 * 1.77 * 1.2in PCB Size: 9.5 * 3.5cm / 3.7 * 1.4in Note: The button battery is just used for memorizing the time when powered off, not power the clock(use DC 5V). The display color might be slight different in the picture because of the lighting effect, pls in kind prevail Package List: 1 * Digital Talking Clock Kit Safety Warning Note: The pcb dont't need soder c0 circuit holes;