Compact ambidextrous design Blue optical sensor, tracks on most surfaces Silent buttons with 2-way scroll wheel (up / down) 800-1600-2400 adjustable DPI Connects to up to 3 devices: 1x USB-C dongle, 2x Bluetooth 5.0 Supports Lenovo Unified Pairing Receiver Supports Bluetooth SwitfPair Quick switch button to jump control across devices Rechargeable, 2 – 3 months use, 1.5-2 hours to fully charge Charges wirelessly through Qi or by USB-C (cable provided)