Logitech WAVE KEYS K820 Ergonomic Keyboard I used it only once after purchasing it, but I'm selling it because I bought another one. It will be passed on to someone who will take good care of it. Batteries and the USB dongle are also included, so you can use it right away! Model number: K820 Color: Graphite JAN code: 4943765063346 Body size: 376 x 31 x 219mm Body weight: 750g (including batteries) Connection method: Wireless (Logi Bolt / Bluetooth)