The new juice pack air allows iPhone 5 users to do more with their device on one charge, packing 1700 mAh to double the battery life of the device with the simple flip of a switch.

ENGADGET: Mophie Juice Pack Air brings an extra 1,700 mAh to iPhone 5 for $100

Customers using HTC's newest flagship smartphone with a mophie juice pack can rock, talk, surf, and send for twice as long with the simple flip of a switch, receiving the benefits of double the battery life on one charge.

ENGADGET: Mophie Juice Pack for the HTC One now available Mobile

Switch profiles with a simple swipe of the touchscreen and the device will be set up to show the data riders need for that ride.

ENGADGET: Edge 510 and 810 cycling computers appear on Garmin's web store (update: hands-on photos)

Both models feature a new capacitive touch control design that allows the listener to change volume, switch channels or jump streams with a simple swipe or tap.

ENGADGET: Koss intros Striva headphone systems, lets you stream music over WiFi straight to your ears

Users will be able to switch from one profile to another with a simple click of an app, and they will receive both work and personal notifications within both profiles.

ENGADGET: Galaxy S II does work and personal phone duties at once with Telefonica's Dual Persona service

We saw a number of Electric Imp demos and appliance ideas at the booth including a simple hand-held "detonator" toggle switch with LED, seven-segment counter, water level sensor, servo-controlled gauge, RGB light, power socket, Christmas light, power monitor, toy washing machine, 16x16 LED display and receipt printer (the latter two being combined to show the avatars and tweets of anyone mentioning the Electric Imp) -- all Internet aware.

ENGADGET: Hands-on with the Electric Imp at Maker Faire (video)

In order to fully exploit the sound potential of the HDVD 800 with any audio source, a rotary gain switch at the rear of the unit provides simple adaptation of the amplifier output to the audio input voltage.

ENGADGET: Sennheiser unveils HDVA 600 analog headphone amp, asks for $1,600