Check the setting of answering method on your cell phone and confirm if need some setting when connecting the Bluetooth device.
The built-in 2500mAh battery of charging case will charge automatically once the earbuds are put in. You get about 160 hours standby time when earbuds fully charged. In addition, the charging case can act as a power bank for charging mobile phones and other USB devices.
Support HSP, HFP, A2DP, AVRCP. Provides in-call stereo sound. Also own fast and stable transmission without tangling.
Type: In-ear True Wireless
Model: TOZO NC9 Plus
Driver: φ9mm dynamic driver
Frequency response range: 14Hz - 20kHz
Audio codec: AAC/SBC
Noise control modes: Noise Cancellation/Leisure Mode/Custom Pattern/
Reduce Wind Noise/Transparency Mode/Noise Cancellation Off
Call noise cancellation: Dual-mic ENC call noise reduction
Bluetooth version: Bluetooth 5.0
Effective Bluetooth range: 10m
Battery capacity: 70mAh(earphones)/2500mAh(charging case)
Music play time (AAC, default setting, 50% volume)*: 13h (single charge)/160h (with charging case)
Cable charge time: 2h (earphones)/3h (charging case)
Charging port: USB Type-C
Wireless charging: Wireless charging supported
Water resistance - earphone: IPX6