Sony VGP-BKB1. Device interface: Bluetooth, Keyboard layout: QWERTY, Frequency band: 2.4 GHz. Colour of product: Black. Wireless range: 10m. Battery technology: Alkaline, Battery type: LR6 AA, Battery life (max): 2880h. Keyboard dimensions (WxDxH): 427 x 129 x 28.5 mm, Keyboard weight: 610g