Poly BackBeat Pro 5100 has a classic in-ear design. With one charge, you get up to 7 hours of battery life.
From Amazon
Plantronics BackBeat Pro 5100 True Wireless Bluetooth Headset, In-Ear, IP54 and Noise-Canceling, Black
Scan
Poly BackBeat Pro 5100 True Wireless Bluetooth Noise Cancelling Earbud
OnBuy
POLY BackBeat PRO 5100 Headset In-ear Black