Fangrui Product Details 1.high-performance Version Of Bluetooth Chip V5.4, Stable Output Performance 2.voice Broadcast Throughout The Whole Journey, Miss Any Calls 3.automatic Switch Machine, Save Effort And Worry 4.1000 Mah Battery, 500 Hours Of Battery Life 5.the Continuous Talk Time Is About 10 Hours Charging Time: About 2 Hours Talk Time: About 30 Hours Standby Time: Up To 500 Hours Built-in Digital Power Amplifier, Greatly Increase The Volume And Sound Effect Advanced Multi-point Connection, Support Two Mobile Phones Online At The Same Time Built-in Dsp Noise Suppression And Echo Cancellation Function (cvc8.0 Dual Noise Reduction Technology). Bluetooth Transmission Distance: 10m Speaker: 42w, High-definition Stereo Sound Model Name:bluetooth Mp3 Speaker Special Features:sun Visor Bluetooth Hansfree Car Kit Item Type:bluetooth Car Kit Item:bluetooth Music Receiver Bluetooth Handsfree Car Kit:bluetooth Mp3 Speaker Bluetooth 4.2 Audio Adaptor:car Wireless Audio Adpater Sun Visor Clip:bluetooth Sun Visor Speaker