Dear friends, you need to know the Dear friends, you need to know the description of this product. If you are satisfied, you can buy it at ease. Thank you~ of this product. If you are satisfied, you can buy it at ease. Thank you~ Whitens in just 10 minutes. Perfect for use before some big days. 2 button batteries, sustainable work for 48 hours. Using light activated chemical technology, the clinically tested. Enjoy a brighter, whiter smile with the fast teeth whitening system. The powerful and safe whitening gel contains peroxide, the same enamel-safe ingredient used by dentists. Targets and removes t-ough stains, and provides long lasting results. Fast and easy to use, it can be used conveniently at home. How to Use: Step 1: U-nlock whitening light battery cap. The LED teeth whitening light has an estimated run time of 48 hours on one set of batteries before replacement batteries are needed. LED teeth whitening light takes two button batteries(included). Step 2: Remove Plastic Insert After removing the LED battery cap, remove the contents and locate a clear plastic disc insert. The plastic insert serves as a barrier between the conductor and the lithium ion batteries. A barrier is required to prevent the batteries from losing power. Discard the plastic inserts, re-insert the batteries, and twist the cover back onto the LED teeth whitening light. Step 3: Whiten your teeth! Item Name: Teeth Whitening Light Material: ABS & Electronic Components Power Supply: 2 x Button Batteries(CR2032 or CR2025) Rated Voltage: 6V Blue Wavelength: 460 - 470nM Features: Teeth Whitener, Easy to Use, Portable Size: 6cm x 5cm/2.36" x 1.97" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Teeth Whitening Light