This is an in-ear canal-type hearing aid. It is suitable for those with mild to moderate hearing loss. It comes with a set of 5 alkaline batteries. A self-made manual for first-time hearing aid users is also included. After opening and checking for initial defects, it will be repackaged in bubble wrap to reduce shipping costs. Contents: Hearing aid (1, universal for left and right ears) Eartips (S, M, L) Cleaning brush (1) Alkaline batteries (5) Manual (English) Beginner's Hearing Aid Guide (Japanese, self-made)