HTC TWS3 - Earbud Controls and Indicators; Audio and Call Controls; LED Notification Guide; Technical Specifications

4. When you're done, put the earbuds back in the case to turn them off and
charge them. Make sure to recharge the case periodically.
Controls:
Power on
Earbuds will turn on when removed from
charging case.
Power off
Earbuds will turn off when put back in the
charging case.
Automatically power off
If earbuds are removed from charging case and
don’t pair other any device ,after 5 minutes ,it
will turn off automatically.
Play next
Tap and hold the right earbud for 2 seconds.
Play previous
Tap and hold the left earbud for 2 seconds.
Play / Pause
Tap either earbud.
Volume increase
Tap left earbud twice quickly.
Volume decrease
Tap right earbud twice quickly.
Answer call / End call
Tap either earbud.
Decline call
Tap and hold either earbud for 2 seconds.
Assistant
Triple-tap either earbud.
LED notifications:
Charging case LED
 Flashing blue: Connected to power and
charging
 Blue: Charging complete
 Flashing red: Low battery warning
Earbud LED
 Red: Charging
 Red off: Fully charged
 Flashing red and blue: Pairing
 Off: Connected
Technical specifications:
Bluetooth version
5.1
Bluetooth range
≦10 m
Speaker frequency response
100 Hz - 10 kHz
Play time
Appr.8 hours（Volume level