Check the listing for details. Glasses Optometry Double-sided Display LED Eye Chart Myopia Vision Tester Y. Condition: New. Listed at 55.00 USD. Specification: Vision chart average brightness on white background: 80-320CD, square meter Vision surface brightness uniformity: ≥0.85 Charger input voltage: AC 100-240V Output voltage: 4.2V, 0.5A Measuring distance: 30CM Size: 213x120x15MM Package weight: 0.445KG Payment Way: Please know we just accept paypal payment, thank you! Shipping Details: We will send out the package during handing time, you can receive it in expect delivered time normally, if not, please contact us, we will be responsible for it, thanks! Return Details: We offer 30 days money back guarantee return policy, however, our warranty does not extended to any products that are physically damaged or that are not under normal operating conditions as a result of misuse or improper installation on the buyer/user's part. About Us: If you have any question, please contact us by "Ask a question", we will work with you to until you are satisfied, and our normal business hour is Monday to Friday 9:00 AM to 6:00 PM Hong Kong time GMT+8, all messages and orders will NOT be processed at weekend and holidays, if you are satisfied at our service and product, please kindly leave us a positive comment Green Color + and 5-star (Yellow color) Detailed Seller Ratings, we will automatically leave positive feedback after received positive feedback from you.