Features: Transmitter is built in microphone, equipped with lavalier microphone, convenient to use. The transmitter can adjust the volume and frequency. Transmitter-convert sound into ultra high frequency electrical signal. 360° omnidirectional pickup, superior noise cancellation, clear sound quality. Receiver-receiving lossless signals with 0 delay to ensure perfect audio. Support headphone monitor, you can insert the earphone into the headphone jack to monitor your voice in real time. Both transmitter and receiver are built-in lithium battery, easy to charge. Compatible with DSLR and video cameras, laptop, PC, smartphone, tablet, etc. Small appearance, clip design for hands-free use. Suitable for conference, online class, interview, recording, live streaming, vlog, etc. Specifications: Model: L05A/L05B(optional) L05A: 1 Transmitter & 1 Receiver L05B: 2 Transmitters & 1 Receiver Transmission Frequency Band: 540MHz-690MHz Transmit Power: 10dBm Receiving Sensitivity: -40dBm Pickup