The huawei freebuds 4i feature an in-ear design for increased comfort when worn. the they can quickly connect with other devices such as phones, tablets, and pcs over bluetooth to make phone calls and play music. featuring a 10 mm-diameter dynamic driver unit, two microphones for environmental noise cancellation during calls, feedforward active noise cancellation (anc), and awareness mode, the huawei freebuds 4i earbuds deliver crystal clear audio. with a low power solution and 55 mah battery, the huawei freebuds 4i earbuds have a long battery life* and a fast charging speed via the charging case.