Travel White Ambidextrous RF Wireless + Bluetooth Scroll type: Wheel Buttons quantity: 2 Power source: Batteries Built-in battery Rechargeable Lightweight and ErgonomicEchelons low-profile curves were designed to sit comfortably in your hand over long periods of use, then slip neatly into your pocket or bag for transport to your next meeting.Modern and MinimalistWith a clean, understated design, the Echelon Wireless Mouse looks great on any desk, offering a whisper-quiet click that wont annoy your co-workers.Switch Devices With a Single ClickEchelon makes multitasking easy, with a button to quickly switch between two paired Bluetooth devices (such as your MacBook and iPhone) and one connected with its 2.4Ghz USB-A dongle.No Batteries NeededThanks to our innovative USB-C port placement, Echelon can even be used while its recharging. Mouse Bluetooth version 3.0 Frequency band 2.4 GHz Multi-device support Yes Buttons type Pressed buttons Buttons quantity 2 Scrolling directions Vertical