Sennheiser CX 400BT True Wireless

7mm

5 - 21000 Hz

Yes

5.1

SBC, AAC, aptX

Up to 7 hrs music playtime with earbuds | Up to 20 hrs music playtime with charging case

1.5 h for full charge / 10 min for 1 h playtime

59 x 33.8 x 42.3 mm

6 g