· Product model: BLS-B21

. Supported devices: Support two mobile phone connections

· Bluetooth version: 5.2
·Output interface: 3.5mm stereo RCA left and right channels
. Function introduction: U disk, latest support MP3, WMA, WAV, FLAC, APE format. Hands-free call, NFC connection

· Bluetooth protocol: AVRCP, A2DP
· Frequency range: 2400-2483.5 MHz
· Frequency response: 20Hz-20kHz
·Output power: 28mW RL = 16Ω
· signal to noise ratio: > 90dB
·Total harmonic distortion: < 0.1%
· Support SBC, AAC
· Forward transmission distance: 10 meters
· Support Micro USB interface 5V power supply
· Product size 78 * 50 * 18 (mm)

Feature:
● Connects to a 3.5mm audio interface,
allowing non-bluetooth speakers to play music wirelessly
● An old-fashioned power amplifier transformed into a Bluetooth speaker
Breaking away from the traditional wired constraints, listening to music wirelessly is more free
● Car Bluetooth hands-free calling