SPECIFICATIONS:
Bluetooth version: V5.0
Chip: JL
Bluetooth range: 15m
Output power: 5W RMS
Driver diameter: 57mm
Frequency response: 100Hz - 20kHz
Battery: 1200mAh / 3.7V
Sensitivity 84dB +/- 2dB
Signal to noise ratio: >/= 65dB
Distorzija: 1%
Charge time: 2.5 - 3.5h (by micro USB plug)
Playing time: 3-5h (60% volume level)
Dimensions: 150 x 60 x 100 mm
Functions: Hands-free call / U-disk / TF card / AUX / BLUETOOTH / TWS

TWS - true wireless stereo is an function which allows you to connect two BT-803 units into a wireless stereo system.
         - to connect two units, you need to turn ON both speakers at the same time in BT mode and speakers will connect automatic