Bone Conduction Headphone Noise Reduction Wireless Bluetooth Neck Hanging Headsets with Microphone

Description:
Name: Bone Conduction Headphone

Bluetooth-compatible version: V5.2 version;
Patent No.: 202130669191.1;
Product implementation standard: GB 8898-2011;
Battery: 110MAH;
Talk time: about 8 hours;
Music time: about 8 hours;
Communication distance: about 10 meters;
Battery type: lithium polymer battery;
Supported protocols: HEP/HSP/A2D/AVRCP;
Frequency: 20Hz-20KHz;
Impedance: 32 ohms;
Sensitivity: 85dB/mW;
Waterproof grade: IPX 5;
Speaker material: copper ring speaker 14.2mm;
Appearance material: ABS;
Bare metal size: 15x4x3CM;
Bare metal weight: 18 grams;
The size of the whole set: 17.5x9.6x3CM;
Weight: 50G;

Packing list:
1 x Bone Conduction Headphone
1 x charging cable
1 x packing box
Note:
Different displays may cause the color of the item in the picture a little different from the real thing. 
Manual measuring,please allow 1~3mm error,thank you.