Some of the backer levels included Tiggertrap Mobile kits, which we manufacture and have in stock. However, as soon as we realised we wouldn't be able to deliver on our Triggertrap Ada project, we wanted to ensure that the remaining funds were distributed as refunds as fairly as possible across our backers.
This gave us a couple of challenges: For one thing, the vast majority of our backers are existing customers, many of whom already have Triggertrap Mobile kits. While some backers may want extra kits for themselves or to give away as presents to friends, for other backers, receiving another kit may not be a satisfactory outcome of this Kickstarter campaign.
The secondary challenge is one of shipping costs: sending out our mobile kits would further deplete our Triggertrap Ada fund, which means that the remaining refunds would be significantly less than 20%.
So, instead of sending out kits to people who may not want them and risk to partially deliver some of the backer rewards to some backers but not to others, we decided to let the backers decide. If you want a Triggertrap Mobile kit, you're able to select the 50% refund option, receive a credit in the Triggertrap store, place your order, and get your Kit that way. If you'd rather not, and prefer to have the refund as money, that's an option, too.
Link to this FAQ entry: http://tri.gg/faq-adadongles