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General
Brand	Microlab
Model	HB21
Bluetooth Version	V5.3
Audio Information
Speaker Diameter	40mm
Speaker Impedance	32 Ohm
Speaker Sensitivity	108dB ±3dB
Frequency Response	20Hz - 20KHz
Frequency Range	87.5 - 108MHz
Battery Information
Battery Capacity	250mAh + Protection Board
Charging Time	1.5 Hours
Talk Time	About 3.5 Hours
Listening Time	About 8-10 Hours
Standby Time	Up to 4 Months
Connectivity & Interface
Bluetooth	Bluetooth Stereo V5.3
Interface Type	Micro USB, 3.5mm Aux, FM Radio, TF Card
Microphone	Built-in Microphone
Design & Features
Design	Foldable and Swivel Design
Voice Prompt	Yes
FM Radio	Yes
TF Card Support	Yes
3.5mm Aux	Yes
Package Contents
Headphone	HB21 - 1 pc
User Manual	1 pc
Charging Cable	1 pc
Warranty & Origin
Warranty	01-Year Brand Warranty

Features of Microlab HB21 Bluetooth Headphone

The Microlab HB21 Bluetooth Headphone is designed for comfortable everyday listening, calls, and entertainment. It features Bluetooth Stereo V5.3 for a stable wireless connection and a built-in microphone for convenient hands-free calls. The headphone comes with 40mm drivers delivering clear sound with 108dB ±3dB sensitivity and a 20Hz-20KHz frequency response. It supports multiple listening options including FM Radio, TF Card, and 3.5mm Aux input. The 250mAh battery provides about 8-10 hours of listening time and up to 3.5 hours of talk time, while the charging time is approximately 1.5 hours. Its foldable and swivel design makes it easy to carry and comfortable for daily use. Voice prompts provide convenient device status updates, making the Microlab HB21 a versatile choice for music, calls, travel, work, and everyday entertainment.

Microlab HB21 Bluetooth Headphone (Black)