This is a PWM dimming desk lamp based on 555 timer. PWM is known as pulse width modulation signal, which uses pulse width to adjust brightness. The larger the pulse width, the higher the brightness, the narrower the pulse width, the the brightness. Since heat wastes less electricity, the efficiency can reach 90%. The basic frequency of this circuit is about 30KHz, so flicker will not occur. The circuit consists of three parts: charging circuit, PWM signal generator and LED light board. Battery capacity: 1200mAH The charging circuit uses 4056 charging IC. The 4056 is a linear charger circuit designed for potassium ion or potassium polymer batteries. It uses power transistors within the chip to charge the battery at a constant current and constant voltage. If you like DIY and just need a desk lamp, this desk lamp kit is a great choice. Get a nice desk lamp while practicing your soldering skills version: Rechargeable version Material: abs colour: White Package Contents: 1 x Dimmable desk lamp (delivered Shipped in bulk) 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.