The K4 to K4D Upgrade converts a base K4 into a fully independent dual-receiver K4D. This procedure involves plugging in two PC boards, adding two cables, and three machine screws.
For all orders exceeding a value of 100USD shipping is offered for free.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.
Otherwise, standard shipping charges apply. Check out our delivery Terms & Conditions for more details.