1. 2.4G digital signal transmission, the usage range can reach about 30-50 meters. 2. Frequency switching, there are 11 channels to choose from. 3. Built-in lithium battery, fully charged and lasts for about 8-12 hours. 4. Small size and weighs only about 55g. 5. A transmit signal can be connected to multiple receivers (unlimited). High-quality audio transmission, clear sound quality and high restoration. Product Introduction: This is a stereo portable and practical mini wireless in-ear monitoring system that is convenient for outdoor performance and recording monitoring. It has good signal transmission distance and clear sound transmission. The built-in lithium battery can be charged via the Typec interface and can be used for about 10 hours when fully charged. When the signal is disturbed, you can manually switch the frequency to avoid signal disturbance and enhance applicable usage. System technical parameters: 1. Sampling frequency: 16Bit/48KHz 2. Wireless technology: digital 2.4G 3. Delay rate: Stereo 15ms 4. Battery life: TX - 7-8 hours, RX - 10-12 hours 5. Frequency response: TX-20Hz-20KHz, 0dBV (1Vrms); RX-20Hz-20KHz, +1.5dBV (1.2Vrms) 6. Noise bottom limit: TX-85dBV; RX-89dBV/(-94dBV after noise gate is opened) 7. Transmission distance: 30m (Greater than 50m in the optimal open environment) Color:Black Material:plastic Package Contents: 1 * Audio Transmitter 1 * Audio Receiver 1 * Earphone 1 * Instructions in Chinese and English