The MONO is a standard smartphone crafted by NTT DOCOMO that pairs high quality with low cost. Its most distinctive feature is the waterproof silent-mode switch that allows users to quickly respond to their surroundings. Tempered glass has been employed on the front and rear to improve its texture, and the device features an aluminum power key. With a rounded shape that fits easily into the palm and a pocketsize width of 69 mm, the approximately 4.7-inch liquid crystal display can be operated using only one hand. As this device supports high-quality calls and is both waterproof and dustproof, any operator can use it with confidence and ease.