Features:OOTDTYbrand new and high qualitySPDIF + AUX Port: You get maximum flexibility with support for both 3.5mm (AUX and RCA) and optical (SPDIF) digital, both input and output are supported.In transmit , this device can pair with two Bluetooth-enabled headphones or speakers to for play music simultaneously. In receive , it can pair with two for Smart phones at the same for time, but the music played only by one mobile phone. If you want to to another phone to for play music, you need to or end the music on the current phone.Using CSR BC8670 Bluetooth-compatible chip as the data proceing, the Bluetooth-compatible version is: 5.0Transmitting power: Cla II, use within 10 meters (the actual depends on the device to it)The main chip data storage uses internal 16M memory; Frequency : Bluetooth-compatible standard, 2.4022.480GHz; Support A2DP AVRCP ; Support SBC, APT-X and other CodecSpecifications:Chipset: CSR BC8670Supported : A2DP AVRCPSupported CODEC: APT-X, SBC and othersBluetooth-compatible Version: V5.0Frequency: 2.40GHz-2.480GHzTransmit Power: Cla II, within 10 metersCharging Input: for Dc 5V,300MAWorking for Time (AUX, reception status): 15HWorking for Time (AUX, for LAUNCH status): 15HWorking Time: (SPDIF, reception status): 12HWorking Time: (SPDIF, for LAUNCH status): 12HBattery: 350mAh Rechargeable Li-polymer BatteryPackage Weight: 127gDimension: 60 x 60 x 18.4mm 2.36 x 2.36 x0.72inchThe supported Bluetooth-compatible speaker or headset pairing security keys are: 0000, 1111, 8888.Charging time:2 hours; Charging input requirements: 5V for Dc 300MA350mAh lithium polymer rechargeable batteryWorking temperature: -1055Package Includes:1 x Bluetooth-compatible 4.1 Transmitter and Receiver1 x USB Cable1 x 3.5mm AUX Cable1 x Optical Cable1 x RCA Cable1 x User ManualNote:Due to the problems of lighting effects and angles, there will be certain tolerances in the product, please understand.Please allow 0-1cm error due to the manual measurment.