Harper HB-517, Instruction Manual

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Dialing the last call
To dial the last phone number in the call list, briefly
touch the touchpad on the right or left earpiece
four times.
Restoring synchronization between the
headset
If the headphones do not synchronize with each
other, synchronize them manually:
Turn on the headphones and triple-tap the
touchpad on the left earpiece. Within five
seconds, the headphones are synchronized with
each other. If the headphones are out of sync,
turn them off and on again by double-tapping the
touchpad on the left earpiece.
Technical parameters
Earbuds
Battery: 50mah
Bluetooth Version: V5. 0
Speakers: 1 x 5mm 14 Ohm
Speaker frequency response: 20Hz~20kHz
While working in the mode of listening to music up
to 3h (at average volume level)
Charging time up to 2H
Bluetooth Protocol: HSP/HFP/A2DP/AVRCP