Digital diaplay: The kit has a PCB design with a real-time score display at the top of the digital tube, which gives you a quick readout of the values. Functional: The kit is suitable for students, engineers, hobbyists and anyone interested in game making to hone hands-on and soldering skills. And shipped loose, you will need to install it yourself. Comes with 7 games of the 51 single-chip game, enough to be strong. Need your own hands welding, simple and easy.<br><br>Power supply:4x1.5V AAA batteries or USB DC5V, Choose one of the two and cannot be used at the same time. (batteries are not included) Maximum operating current: about 5V@80mA (dot matrix is fully lit, buzzer sounds) Sleep current: 5V less than 1uA It's DIY kits, needs to finish by yourself. Note:due to different production batches, the screen printing on the circuit board is different, and the Component parts may also be different, but it does not affect the use. Specifications:Blue Shell Colour:Black Material:PCB+components+plastic<br><br>Package Contents: 1 * DIY kit 1 * shell 1 * USB cable(USB cable color is random, and designation is not accepted)<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.