Comfortable ergonomic design, relaxed arm and hand: Your hand naturally fits the ergonomic shape, which is comfortable and sculpted. Easy thumb control and accurate tracking: excellent control over the cursor on any surface. Use the Logitech Options software to change the cursor's speed. Ideal for confined spaces: The trackball is ideal for crowded desks and small spaces because it doesn't move. Multi-OS and two methods of connection: With a 33-foot (10-meter) range, connect easily via Bluetooth or the USB receiver and never worry about lag or drop-offs. Value nominal: 400 dpi Post-consumer recycled plastic (off-white: 21%, graphite/black: 50%) is one of the plastic components in ERGO M575. responsibly packages using paper that has earned the FSC certification. With the USB receiver, you can use your trackball for up to 24 months on a single AA battery.