Specification: Working time: 6 hours;  Charging time: 2.5 hours;  Material: Aluminum alloy & ABS;  Transmission range: Up to 160ft（50M);  Transmitter and Receiver built-in 400 mAh rechargeable lithium-ion batteries;  Applications: Suitable for teaching, fitness instruction, public speech, trainers, stage performers, business conversation, conference,  Web podcast, Meeting,YouTube recording, Outdoor recording, Yoga instructor, Ball game podcast etc.     Features:  -Adopt advanced UHF(Ultra High Frequency) wireless transmission technology, transmission distance Upgrade to 160 feet (50M).  -2 Audio Jack Supports: Support 1/8"(3.5mm) and 1/4"(6.35mm) jack, fits for almost all Speaker, Sound bar, Voice Amplifier, Camera, Audio System, etc (Notice: Not For Phone) -Power saving function (Automatically turn off if 5 minutes no using) -The dual Micro USB cable can charge both the wireless transmitter & receiver at the meantime.  -Plug and play, press the power key of the receiver and headset for a long time to start the machine.     Packaging List: 1 * Microphone;  1 * Receiver;  1 * USB charging line;  1 * D3.5 to D6.5 joint;  1 * D3.5 connecting line;  1 * Manual