Features: brand new and high quality Gear setting: It is set to 8 gears in total. The intensity is mainly adjusted by changing the discharge pulse width. The minimum pulse width is 125uS and the maximum is 4.4ms. Working mode: There are 5 working modes, and each mode is composed of 6 different electric excitation modes. Multi-function: with charging instructions, buzzer prompts, low-battery working instructions. Wide range of applications: suitable for facial cleansers, car chargers, baby bottle warmers, handheld fans, heaters, fill lights, humidifiers, hair ball trimmers, etc. The package includes: 1x Lithium Battery Board. Package Includes: 1x Circuit Board Specifications: Material: Plastic + Metal Size: Approx. 41.55x41.84mm/1.64x1.65inch Layer: Double Panel note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.