Features: is built in microphone equipped with lavalier microphone convenient to use. The can adjust the and frequency. -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 and receiver are built-in lithium battery easy to . 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: L05AL05B(optional) L05A: 1 & 1 Receiver L05B: 2 Transmitters & 1 Receiver Transmission Frequency Band: 540MHz-690MHz Transmit Power: 10dBm Receiving Sensitivity: -40dBm Pickup Method: Omnidirectional Audio Frequency Response: 100Hz-20KHz±3dB Dynamic : 90dB Signal-to-noise Ratio: 97dB Max. Input Sound Pressure: 97dB SPL Power Supply: Built-in Rechargeable Lithium Battery Item Size: 6.5 * 5.0 * 2.6cm / 2.6 * 2.0 * 1.0in Item Weight: 43g / 1.5oz Packing List: 1 * 1 * Receiver 1 * Lavalier Microphone 1 * Phone Cable 1 * Cable 1 * Charging Cable 1 * Type-C to 3.5mm Adapter 1 * User Manual(English)