Interface: Bluetooth Ver4.2LE Class2, USB Type-C (cable not included)Wireless operating distance: up to 10mCustomization function: DIP switch, keymap change function (Note 1)Number of keys: US array 60 keysKey specifications: Capacitive non-contact method, keystroke 4.0 mm, pressing pressure 45 gSize (mm): 294 (W) x 120 (D) x 40 (H) mm Up to the top of the key topWeight: 540g (without batteries)Power supply: 2 AA batteries, power supply from USB connectorOperating time: Estimated when using alkaline batteries: Approximately 3 months (test values in our environment, not guaranteed values)Supported OS (Bluetooth connection): Windows 8.1 / Windows 10, macOS 10.14 or later (Note 2),Android 4.4 or later, iOS 11.4 or later, iPadOS 13.0 or laterSupported OS (USB connection): Windows 7 / Windows 8.1 / Windows 10, macOS 10.12 or later