BluetoothÂ® Wireless Folding Travel Mouse Folds flat for easy pocket-sized storage during travel, but transforms to provide a comfortable ergonomic shape when in use. No need for a clumsy dongle or a free USB port. After pairing with any compatible BluetoothÂ® device, the Track Slim will then automatically connect wirelessly when powered on. Silent-Click switches are up to 90% quieter than other standard mice while still providing positive tactile feedback. The Track Slim automatically powers on when folded into working position and powers off when folded flat for storage. When powered on, sleep mode is automatically engaged after 10 minutes of inactivity.