This is an Elecom Bluetooth keyboard, model TK-CB02BPKBK. I am selling it because I bought it new but didn't use it much, and then purchased another one. Wireless keyboard Bluetooth Works With Chromebook certified, pantagraph type, antibacterial, black. If you need it, I will also include a Sanwa wireless keyboard SKB-WL39BK. (It lights up briefly when batteries are inserted, but then turns off due to poor contact?)