Fangrui Product Details Model Number: Csr8675 Bluetooth Version Bluetooth V5.0 Supported Protocols Rx: A2dp Avrcp Tx: A2dp Operating Frequency Band 2.402ghz -2.480ghz Power Level Power Level Class I Sensitivity (-80dbm Less Than 0.ber) Signal-to-noise Ratio 5db Distortion . Support Dual Stream (tx Mode) Support (one Transmitter Connects To Two Bluetooth Speakers Or Headphones At The Same Time And Uses One Codec) Support Multipoint Connection (rx Mode) Support (connect Two Mobile Phones) Codec Mode Codec Tx: Apt-x Hd, Apt-x Ll, Apt-x, Sbc; Rx: Apt-x Hd, Apt-x Ll, Apt-x, Sbc; Aptx Usage Notes When Single Connection, Apt-x Hd Codec Is Preferred (the Connected Device Must Also Support Apt-x Hd) Built-in Battery 1000mah Charging Current: About 200ma Charging Time: About 4.5 Hours Battery Life: Rx Greater Than 20h, Tx Average About 15h Bluetooth Distance: Greater Than 80m (straight Line Without Obstruction) Charging Method: Micro-usb 5v/0.5a Input/output Connection Method: Spdif Interface, I2s Aux Interface Compatible With: