There are two colors, white and green Feature: 1. Using this product can stimulate neurotransmitters in the cerebral cortex through micro currents, thereby regulating emotions and promoting sleep.2.Small and convenient, you can carry it with you.3. The battery capacity is 300mAh, USB is convenient for charging, it can be connected to the computer's USB port, mobile power, power supply and other charging methods.4..Suitable for people with insomnia, overthinking, etc. Specification: Product material :ABSProduct size: 40.5*38.5*68.5mmInput voltage: DC 5VWorking power: 0.03WCharging port: USB Charging Package Included: Sleep meter x1USB Cable x1User Manualx1Eye mask + earplugs+3 sleep stickers x1 (depending on whether you choose eye mask earplugs and 3 sleep stickers) Notes: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. The specific color of the received goods shall prevail.2. Due to different manual measurement methods, please allow a slight size difference. Product Detail Precaution Please read the instruction manual before using this product This product is not a medical device and is not recommended for medical use Please do not use with the following medical electronic equipment: Medical electronic devices implanted in the body such as cardiac pacemakersMedical electronic equipment for life-sustaining such as artificial heart and lungsMedical electronic equipment such as electrocardiographIf the patient uses high-frequency surgical equipment and massager on the body at the same time, the electrode pads may bow | burns and may damage the product.If the massager is used near shortwave or microwave treatment equipment (1M), the output of the massager may be unstable In the following situations, please consult your doctor for use: Patients with acute illnessPatients with malignant tumorsPatients with infectious diseasesPregnant womenPatients with heart diseasePatients with high feverPatients with abnormal blood pressureOther patients who are being treated by a doctor and feel abnormalities, etc. Shipping 1.If you choose to ship from China, we ship by the AliExpress Standard Shipping; if you choose to ship from overseas warehouses, we will ship by the local logistics delivery.2.Your order is generally shipped within 24h, please kindly be more patient to wait.3.Anything please feel free to let me know,we will solve it for you as soon as possible. Service 1. If you have any questions, please feel free to contact us. And we will reply in 24 hours except weekends.2. If any problems comes to you, please don't worry. You can contact us first. We promise we will try everything possible to help you.3. Please pay attention to the time difference between us. We work in China About Working Time Due to the different working time in each country, there will be a delay in communication, but messages will be replied within one workday.If you have any question about product, please feel free to contact us. We try to provide you the Best Customer Service.