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Instruction: ✦Long press 3 to 5 seconds to turn on / turn off the device. ✦Short press the on / off switch to choose the grade (The second light indicates grade 1, the first light indicates grade 2, simultaneous flash indicates grade 3). ✦When cleaning, the tip should be placed vertically on the junction of the teeth and calculus or smoke stains. ✦Do not press hard or fast to cut back and forth on the calculus. ✦Keep the tip in a fixed position for 3 to 5 minutes, until the stains or calculus are clearly falling off and then move elsewhere. Repeat several times. ✦Rinse the mouth after treatment. Specifications: ✦Item Type: Sonic Dental Calculus Removal ✦Head Material: 304 Stainless Steel ✦Color: silver ✦Waterproof: IPX7 ✦Voltage: 90-250V Frequency: ✦27000 times / min ✦29000 times / min ✦31000 times / min ✦Clean Modes: 1. Teeth Stain 2. Tartar 3. Stubborn Calculus ✦Working Time: 2 hours' Continuously Used. 40 Days' Stand by Package Includes: ✦1X Dental Scaler