Key features: -Transmitter operates as a clip-on microphone or beltpack for a lavalier/headset microphone.  -Ultra-compact form-factor – transmitter and receiver weigh a minuscule 31g each.  -Series D 2.4GHz digital wireless transmission with encryption delivers crystal-clear audio under any conditions and excels in dense Wi-Fi and Bluetooth environments (shopping malls, conventions, hotels etc).  -Up to 100m range (line-of-sight), optimised for short-range operation in congested RF environments.  -In-built rechargeable batteries that last up to 7 hours, charged via USB-C.  -Super easy to use – transmitter and receiver auto-pair in under three seconds.  -3-stage output pad (0dB, -12dB and -24dB) and battery saver mode.  -Use up to eight systems in one location.     System Specifications: Transmission frequency band:2400MHz~2483.5MHz;  Audio frequency response:100Hz~16KHz+3dB;  Dynamic range:93dB(Circuit performance);  Signal to noise rayio:93dB(Circuit performance);  Maximum input voltage:97dB SPL(Built-in microphone);  Pairing type:Automatic;  Effective Working Distance:50~60m(there is block);  100m(in open space);  Working temperature:-5℃ to + 50 ℃;     Receiver Specifications: Transmission frequency band:2400MHz~2483.5MHz;  Transmission type:frequency hopping/digital FSK;  Receiving sensitivity:-86dBm;  Antenna method:Built-in F type antenna;  Display mode:multi-function LED display mode;  Power requirements:built-in lithium battery,standard USB 5V charging;  via TYPE-C interface;  Battery life>7 hours;  Output connector:3.5mm TRS;  Working temperature:-5℃ to + 50 ℃;  Dimensions:50mm*44.5mm*15mm;  Weight:35g;     Transmitter Specifications: Transmission frequency band:2400MHz~2483.5MHz;  Modulation type：frequency hopping/digital FSK;  Transmit power:10dBm;  Antenna method:Built-in F type antenna;  Microphone pickup method：omnidirectional （built-in microphone and External lavalier）;  Display mode:multi-function LED display mode;  Power requirements:built-in lithium battery,standard USB 5V charging via TYPE-C interface;  Battery life>7 hours;  Output connector:3.5mm TRS;  Working temperature:-5℃ to + 50 ℃;  Dimensions:50mm*44.5mm*15mm;  Weight:35g;     Package Contents: 1 * Receiver;  1 * Transmitter;  1 * 3.5mm TRS-TRRS Audio Cable;  1 * 3.5mm TRS-TRS Audio Cable;  1 * Charging Cable;  1 * Wind Muff;  1 * User Manual