LED Accelerator Light is used to accelerate the whitening process. Advanced light combined activates the teeth whitening gel to rapidly remove surface stains and penetrates deep to remove embedded residue. please open the battery place and remove the batteries you will find a plastic transparent piece remove it to make the device works for the first time Additional Details ------------------------------ Product description: LED Accelerator Light is used to accelerate the whitening process. Advanced light combined activates the teeth whitening gel to rapidly remove surface stains and penetrates deep to remove embedded residue. please open the battery place and remove the batteries you will find a plastic transparent piece remove it to make the device works for the first time Directions: To use the VeniCare LED Accelerator Light for teeth whitening, follow these steps: 1. Open the battery compartment and remove the batteries. 2. Take out the plastic transparent piece found inside the battery compartment. 3. Insert the batteries back into the device. 4. The device is now ready to use with your teeth whitening gel to accelerate the whitening process.