This is a product with some issues. ① The left click on the mouse body feels slightly raised. There are no problems with clicking operations or functionality. ② When the mouse is shaken, there is a rattling sound inside. This is a ball mouse, so it shouldn't be a problem, but please be aware if you are sensitive to such things. ★ There are no problems with the mouse's functions or operations in either ① or ②. Included items are the mouse body and receiver. Purchased in spring 2025, used for six months. Product Name: ERGO M575S Brand: Logicool (Logitech) Color: Black Connectivity Technology: Bluetooth, USB Features: Wireless Movement Detection Technology: Trackball Number of Buttons: 5 Thank you for viewing. Connection Type: Wireless (Bluetooth) Power Supply: Battery-powered