product manual:
Headphone light status indication
Power on: blue LED light
Shutdown: red LED flashes 3 times
When charging: the red LED is bright
Charging completed: red LED off

Matching instructions:
First paired with two Bluetooth headsets
Pair the Bluetooth master device to achieve stereo
The left and right ears of S2 are paired at the factory.

Product information:
1. Name: (TWS) S2
2. Size: 39 x 56 x 188mm
3. Earplug weight (each): 5g
4. Charging box: 100 grams
5. Output power: 5mW
6. Channel: Stereo
7. Frequency response: 6HZ-20kHz
8. Signal to noise ratio: 295dB
9. Battery capacity earlobe (each): 60mAh
10. Charging box: 1200 mAh
11. Battery charging time: earplugs for 90 minutes
12. Charging box: 2 hours