Total usage time is about 30 minutes. I bought it as a spare keyboard, but I haven't used it much, so I'm selling it. [Domestic Genuine Product] Keychron B1 Pro Ultra-Slim Wireless Keyboard, 2.4 GHz/Bluetooth 5.2/Wired Connection, Long Battery Life, Compatible with Mac Windows Linux (Silver, JIS Layout) Brand: Keychron Keyboard Description: Scissor Switch Color: Silver - Keyboard - Cover (Silicone) - Case (Box) - Receiver, cable, conversion adapter The Keychron B1 Pro features scissor switches and is a lightweight, ultra-thin wireless keyboard that achieves a long battery life of 1,200 hours. It supports 2.4GHz wireless, Bluetooth, and wired modes, and can be easily connected to smartphones, tablets, PCs, and Macs. With ZMK customization, you can set it up for various uses, such as at home, in the office, or while traveling. A silicone cover is also included. [Quiet Typing] The scissor switch keys are quiet, which is especially appreciated in quiet environments such as offices or late-night at home. You can quickly access emojis with fn+shift, making chatting with friends easy and fun. Program any key with a web app - You can remap any key and macros with the Keychron Launcher web app (no download required) or ZMK firmware on the latest Chrome, Edge, and Opera browsers, regardless of MacOS, Windows, or Linux. [1200 hours of use on a single charge] With a battery life of up to 1200 hours, you can use it without interruption. In addition, the concave keycaps ensure accurate input and provide comfortable typing that naturally fits your fingers. [Compatible with all devices] While maintaining compatibility with Windows, the B1 Pro offers a Mac layout and is one of the few keyboards on the market that provides a more comfortable typing feel while having the same multimedia and function key functions as an Apple keyboard for Mac users. Keyboard layout: Japanese