A particularly striking element of the waterproof and dust-resistant Mono MO-01J smartphone is the switch positioned on the side with which users can respond to their environment and turn on the silent mode. Tempered glass was used for the front and back to improve stability; the on/off button is made of aluminium. With its rounded edges and a width of 69 mm, the smartphone can be comfortably held with one hand and also fits into a shirt pocket.