Includes USB reciver. The device seems to work, I just am unable to get it to pair with the USB receiver. Let me know if you have any questions or would like additional pictures. Thanks!

The Logitech M570 Wireless Trackball Mouse is a black, right-handed only mouse with a blue ball. It features wireless and USB connectivity, an LCD display, programmable buttons, ergonomic design, thumb button, scroll wheel, battery status indicator, on/off switch, side to side scrolling, and 4-way scrolling. This product is being sold for parts or not working.