Lenovo Bluetooth Neckband HE05

BT version 5.0, Material: metal, silicone, TPE,
Distance: 10m, Waterproof: IPX5, Dustproof:
IP6X, Battery: 3.7V / 80mAh, Working time: 8
hours, Standby time: 120 hours, Charging
time: 2 hours, Horn diameter: 10mm,
Speaker sensitivity: 98dB, Frequency
response range: 20-20KHz.