Product information:  

Product Name: Bluedio/ Ei
Blue string model: EI
Function: call function
Headphone material: plastic
Channel: 2
Bluetooth version: 5.0
Color Category: White
Package type: official standard
Headphone category: true wireless headphones
Waterproof performance: IPX3
How to use: In-ear
Transmission radius: 10m
Whether single or dual ear: bilateral stereo
Smart type: other smart
Transmission radius: 10m
Connection between the left and right cavities of the earphone: wireless connection
Dustproof performance: IP3X
Headphone and playback device connection method: Bluetooth connection