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Brookstone HDMI pocket-sized projector (pocket projector)
This pocket projector is perfect for presentation on the fly. It cranks out 1080p high-definition video up to 60-inches diagonally, and connects all HDMI-based devices. It can run for up to two hours on a single charge, and includes dual built-in speakers. All this, and it fits in the palm of your hand, or even in your pocket. (And, if you want to crank it out to play games from your smartphone in your hotel room, we won't tell anyone.)
Sennheiser MM70s (in-ear headphones)
These in-ear headphones are perfect for deep bass and vibrant music, while blocking out outside noise. And these headphones, which rest in your ear, come with an inline remote, including volume control, for call controls. These headphone are a universal 3.5mm fit and work with the very vast majority of smartphones, tablets and laptops.
Google Chromecast (video streamer)
Business doesn't have to be "all business." One has to take into account the lesser-considered in-hotel entertainment. Google Chromecast is a cheap, USB-based device that allows you to stream video content from your laptop or smartphone over Wi-Fi connections for quick and easy TV or movie viewing. It plugs into most modern TVs equipped with USB ports, but requires your smartphone on hand to act as the remote control.