Full voice broadcast,Automatic switch function, save effort and worry,voice control 550mAh battery, 500 hours long standby time,Continuous talk time about 10 hours Built-in digital amplifier greatly enhances volume and sound effects,Advanced multi-point connection, support two mobile phones online at the same time Built-in DSP noise suppression and echo cancellation (CVC8.0 dual noise reduction technology) Please check as much as possible to make sure the item is what you need. Bluetooth chip Version: V5.4+EDR • Support connecting two mobiles at the same time,Support A2DP function. • Built-in rechargeable lithium-ion battery 550mHA, standby about 500 hours. • Holding time About 10 hours • Support automatic connection • Support private answer • Support coming call number readout • Build-in DSP noise suppression and echo cancellation function • Loudspeaker:4Ω2W compatible Handsfree Car Kit Sun Visor Note: The Bluetooth version will be updated over time, please do not place an order if you mind. Color: As Shown Material: plastic Package Contents: 1*Car Bluetooth System Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.