Panasonic RP-HTX20BE has a classic in-ear design. It has up to 9 hours of battery time.
From Amazon
Panasonic RP-HTX20BE-K In Ear Wireless Bluetooth Headphones, Retro Style with Microphone, Smart Voice Control and Comfortable Ergonomic Fit - Black
OnBuy
PANASONIC RP-HTX20BE-K Sport Bluetooth Headset / BLACK - Black