Overview
The advanced chip guarantees exceptional performance by delivering consistent and lossless audio streaming, guarantee the stability of the connection signal within 20 meters between the earphone and phone.
TF Card MP3 Music Mode Clear Sound, HIFI Bass
10mm large strong magnet speaker makes good music
CVC Audio Technology could cancel the background noise when calling.
All-day Listening(500mAh battery)
Enjoy about 40 hours of music time after a full charge
About 300 hours standby time
Neckband lightweight design with soft material
Perfect Fit, Never Fall Out
Lightweight and ergonomic design fit in your ears securely and comfortably. Never falling out even when you're running.
Simple Button Control
Volume control, songs change, play and pause, answer and reject calls with the just press on the buttons on the right earphone, no need to operate on the phone.

Specifications
Transmission range: 10 meters
Function: Battery display, call function, music support, multi-point connection
Bluetooth protocol: 5.0
Channel: Stereo
Usage: Hanging ear type
Single or dual-ear: Bilateral stereo
Color: Black red, black silver, obsidian, black green
K31 is equipped with a 500 mAh high-capacity battery, which can continuously listen to songs
About 40 hours, let you enjoy sports.
5.0 ear-mounted non-ear wireless sports waterproof, a card can be inserted

Package Content
1x Bluetooth Earphone
1x Manual
1x Charging cable
2x Spare earplug