Used once. ELECOM TK-DCP03BK Keyboard with Stand and Trackball I bought it new, but only used it once. Keyboard with Stand (Trackball) TK-DCP03BK ¥17,600 (tax included) Discontinued JAN code: 4953103300958 Features a mechanism to stand a tablet on the keyboard! This Bluetooth(R) keyboard for tablets with a trackball supports 3-device multi-pairing and wired connection, for a total of 4 devices. Connection method: Bluetooth(R) wireless/USB wired connection Interface: Bluetooth(R)/USB-A/USB microB Compatible devices: PCs, tablets, and smartphones compatible with Bluetooth(R) HID profile Supported OS: Windows 11, Windows 10, Windows 8.1/Android 9.0/iOS 13.4, iPad OS 13.4/macOS Catalina (10.15) *Updates to the latest versions of each OS and installation of service packs may be required. *Please check the compatibility chart for the latest information. Color: Black Number of connectable devices: 4 (including wired connection. Wired connection only supports Windows and macOS) Communication method: GFSK method Radio frequency: 2.4GHz band Radio wave reach distance: When used on a magnetic material (such as an iron desk): 3m, when used on a non-magnetic material (such as a wooden desk): 10m *Our test value Key type: Pantagraph Key layout: 87 keys (Japanese layout) Key pitch: 17.5mm Key stroke: 1.7mm Number of hotkeys: 11 keys Power supply (keyboard body): 1 AA alkaline battery, AA manganese battery, or AA nickel-hydrogen rechargeable battery / USB bus power External dimensions (keyboard body): Width 280 x Depth 200 x Height 27.5mm Weight (keyboard body): Approximately 555g (excluding batteries) Accessories: Instruction manual / 1 AA alkaline battery for operation check, 1 USB cable for power supply/data communication, 1 USB conversion connector