CLOSE RANGE VISUAL ACUITY CHART, Multi-function visual beacon, multi-angle base, magnetic design REMOVABLE BRACKET SUPPORT, Can be placed horizontally or vertically to provide battery energy INTERCHANGEABLECHARTS FOR MULTIPLEFUNCTIONS, Magnetic cover can be removed and replaced to meet a variety of work needs<br><br>working distance 25cm super thin frame design brightness:80-320cd/m2 input voltage:110v/220v /60Hz output voltage:DC5V, 1000mA Note: Be sure to remove the battery when the plug is powered. otherwise it will cause damage! Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:White Material:ABS<br><br>Package Contents: 1 * Near Vision Chart<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.