Main Features:● Ideal for aerobics / dance / sports instructors● Record audio on both left and right channels● Elegant style miniature microphone is perfect for video use● It is a handheld dynamic microphone， ideal for vocal and instrument ● Provide a perfect wireless solution for any presentation or performance application● Suitable for the situation of Teaching， Conference， Monitoring etc.● Modulation: FM● Output impedance: 600 ohm● Operating voltage: 9V for transmitter / 1.5V for receiver ( battery not included )● Effective distance: 20M Type: Wireless Connection: Wireless Frequency Range : 80 -12500Hz Package weight: 0.209 kg Package size (L x W x H): 14.000 x 12.000 x 4.000 cm / 5.512 x 4.724 x 1.575 inches Package Contents: 1 x Clip-on Microphone， 1 x Transmitter， 1 x Receiver