Completely-in-the-Canal (CIC) is the smallest hearing aid style available. This style fits deeply in the ear canal so is the least visible and suitable for mild to moderate hearing losses. Many users with good hearing for low-pitched sounds report a hollow quality from their own voice and chewing movements; this is because the ear canal is plugged. Due to size constraints and deep placement in the ear canal, this size is the most restricted in terms of providing options that are available in advanced technology, such as directional microphones, or volume and program button controls. This style has the shortest battery life due to small battery size. Users with dexterity problems and reduced fingertip sensitivity may find it difficult to insert and remove this style of aid and change the battery.