Check the setting of answering method on your cell phone and confirm if need some setting when connecting the Bluetooth device.
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Featured with Hi-Res Audio, X1 meets the treble to 44.1kHz which higher than the 20kHz that human can hear. It can even restore the ultrasonic sound of dolphins. The Balanced Armature Driver can excellently reproduction high-frequency sounds such as guitar metals, treble cymbal for drums, etc.
TOZO Acoustic Lab continues to break through the barriers of headphone acoustics. Developed large 12mm High Amplitude Dynamic Driver specifically for TOZO Golden X1, Which is capable of delivering 12Hz bass, even below the 20Hz that human can hear. Restores the earth's trembling subwoofer vividly.
Type: In-ear True Wireless
Driver: φ12 mm dynamic driver + Knowles balanced armature driver
Frequency response range: 12Hz - 44.1kHz
Audio codec: LDAC / AAC / SBC
Noise control modes:
Noise Cancellation / Leisure Mode / Custom Pattern / Reduce Wind Noise/
Transparency Mode / Noise Cancellation Off
Call Noise Cancellation: Triple-Microphone with ENC Call Noise Reduction
Battery capacity: 55mAh(earphones) / 500mAh(charging case)
Music play time (AAC, Default setting, 50% volume)*:
Max Noise Cancellation: 5h (single charge)
Noise Cancellation Off: 8h (single charge)
Cable Charge Time: 2h (earphones) /2h (charging case)
Charging port: USB Type-C
Charging input (charging case): 5V⎓500mA（USB-C）/5V⎓400mA（wireless charging）
Charging output (charging case): 5V⎓50mA*2
Charging input (earphones): 5V⎓50mA
Wireless charger: Qi wireless charging supported
Water resistance - earphone: IPX6
Bluetooth version:BT 5.3
Effective Bluetooth range:10m
Weight (each ear):5.8g（±0.2g）
Weight (charging case):43g（±1g）
Weight (entire device):54.6g（±1g）
Dimensions of charging case:69.9*34.2*38.2mm