Product Name: i9 Bluetooth Headset.
The length of use: 1-5 hours (depending on the volume)
Bluetooth version: 4.2
Bluetooth program: Jieli program / wind tunnel program
Product weight: single ear 4.5g, charging compartment 42g, the whole set of 120g
Charging time: 1-2 hours
Binocular pairing method:
Hold long, first blue, then blink red and blue, short on one side,
When the other side is off, the link is successful and Bluetooth is connected.