SnapJet has a Polymer Lithium Ion Battery that is charged via a micro-USB cable. This same micro-USB port can be used to reprogram SnapJet. The battery will have a 700-900mAh capacity and can print roughly 50 photos before requiring a recharge.
SnapJet will also work with the iPhone 6 Plus. The screen is a lot bigger than our scan-able area though, so part of it will be cropped out. But we will have an (optional) app that can re-size your images and place them in the right spot for SnapJet!
We are creating iOS and Android apps that will allow you to get the most out of SnapJet's technology. The app will resize your photo and position for a perfect transfer to the instant film inside SnapJet. It will also adjust your screen brightness, communicate with SnapJet's hardware, allow you to add effects, and we might even include some cool hacks for SnapJet like multiple exposure ;)
It's completely free and we'll post the source code for all our hackers.
UPDATE: We had a great question about how SnapJet deals with a smartphone's auto-screen-shut-off while exposing a photo. This has not been an issue with any of the phones we've tested, because SnapJet only requires a few seconds scan. However we're now also including a feature in our app so that the screen stays on just in case some users have aggressive energy-saving settings in place.
There's some cool science behind this one! Fingerprints won't affect the image quality because of SnapJet's optical system.
Fingerprints and smudges are only visible because oil left by your fingers on your phone screen refracts light. This means that a small percentage of the light coming from your phone's display is scattered at every angle by the uneven oily film of your fingerprint. SnapJet's fiber optics only allow perfectly parallel light to pass through though so the image is (largely) unaffected. Watch out for deep scratches and cracks though because these things distort the image too much and will show up in the print.
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