Ring Bluetooth Barcode QR Code Scanner Wireless Scanner Warehouse Inventory Finger Scanner Portable Code Scanner 330°Free rotate, easy to switch between left and right hands Long working time: built-in 500mah rechargeable battery. 10 hours of continuous operation, 3-4 hours charging time. How to read:Image Sensor:CMOS 640*480 30fps Method of prompt:Buzzer + indicator (led) Operating voltage:DC 5±10%VDC Interface:Usb; bluetooth; 2.4g transmission Color:Black Material:plastic Package Contents: 1 * Scanner 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.