Lenovo X4 Wireless Bluetooth Headphone

Specifications:
Item name: X4(Bone Conduction Version)
Material: ABS
Color: Black
Operating frequency band: 2.402-2.480GHz
Audio power amplifier: Power amplifier IC HT2144 QFN16
Headphone battery capacity: 150mAh
Wear mode: Neck hanging style
Charging time: 2 hours
Rated input: 5V= 110mAh
Waterproof grade;IPX56
Wireless range: 10M
Running time: About 7 hours
Standby time: 10 days

Model：X3(Dynamic Version)
Bluetooth version：V5.0
Transmission range:≥10m
Speaker size:9mm*13mm
Frequency response range:20Hz-20KHz
Charging current:5V-80mA
Playing time:About 9h
Earphone battery capacity:140mAh