Included in the SMART HEADSET package are three pairs of ear adaptors to fit various ear sizes. For the best experience with your AMBEO SMART HEADSET, it’s crucial to experiment with the different ear adaptors for the best fit. The earpieces should fit in such a manner as to seal the ear canal from external sound, to the same degree as if you were to block your ear canal with a finger. It’s not unusual that different sized ear adaptors work best for each ear. For some individuals, widely available foam ear adaptors provide a more reliable seal.