This SevenFriday HDB, Heavy Duty Box, protects your SevenFriday from water, snow, dirt or scratches! The case of the HDB is made of recyclable nylon crystal and it is closed by a latch handle, a secured closing system. The case is fitted on a nylon fiber and Velcro strap. On top of that the HDB is equipped with a NFC chip, which allows the owner to authenticate the HDB via the SevenFriday app. The HDB fits all the models from the P- series, the M1/01, M2/01 and M2/02.