Features: 1. The luminous mouth shot is smalll and can emit two-color light at the same time. 1).LED red light Wavelength:630nm Red light with a wavelength of about 630nm, penetration depth 0.55nm, can anti-inflammatory and promote repair 2).LED blue light Wavelength:445nm Blue light with a wavelength of about 445nm, penetration depth of 0.25mm, sterilization, oil control, etc. 2. One-button control button, it's very easy to get started. 3. The product structure is simple, you can use it by installing the battery yourself . 4.Convenient to carry,Use it anywhere and anytime,Acne treatment anytime, anywhere. Specifications: Name: Light therapy acne spot treatment Size :13.5*1.5cm Weight:49g Color: Silver,Pink Material: Plastic Power supply: 1 AAA battery (Battery not included) Package included: 1 x Acne Laser Pen (Battery not included) 1 x screwdriver 1 x manual Dry battery installation steps: 1. First unscrew the bottom cover with a screwdriver. 2. Open the bottom cover. 3. Pull open the outer shell. 4. Install the battery .