Color: BlackFrequency: 12 FrequencyMaterial: SiliconePower supply: USB chargingCharging: 1.5hLength of use: 1.5hAccessories: English manual, USB charging cableOperation: Press and hold the power button for 3 seconds. When the red light is on, start working. Press each time to switch the frequency. Press and hold the power button again for 3 seconds. The red light will go out and stop working.
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