Lenovo has unveiled its Thinkpad Reserve Edition laptop, which is due to go on sale in a limited edition of 5,000 individually-numbered units, and cost $5,000 (around £2,461). It comes with a hand-stitched leather case, complete with tapering "flanges" to keep spilled liquids away from the laptop's innards. It also blocks Wi-Fi, so the laptop comes with an external antenna (this is a "feature" apparently, not an "annoyance").