2.4G Digital Transmission, Strong Anti-interference Ability 2.4G (2400 ~ 2483.5MHz) wireless digital transmission and automatic adaptive frequency hopping technology of this wireless lavalier microphone, providing anti-interference ability very powerful, optimized for short- range operation in dense RF and Wi-Fi environments, exceptional sound clarity with rock-solid reliability. Broadcast-Grade Audio Quality COMICA BoomX-D D1 Wireless Microphone could record original sound with quite rich details and provide rather high quality natural sound with extremely low latency (less than 20ms). A higher 48kHz sample rate ensures high-definition recreation of the original audio. Easy Operation & amp; Long Working Hours Transmitter and receiver automatically match when power on. Microphone can work continuously for 5 hours. Real-Time Audio Monitoring With a 3.5mm headphone port in the receiver, you can monitor the recording effect in real time. Malfunctions or signal problems could be perceived and adjusted in time. Clear TFT-LCD Screen Built-in TFT-LCD display screen will show battery status, dynamic audio bar, pairing status, signal strength to easily monitor the recording process. Icons and fonts are clear and easy to read. COMICA BoomX-D D1 is a 2.4G wireless lavalier microphone system specially designed for interview and youtube video shooting. Mini, portable and high quality recording, meeting many kinds of consumer needs. Characteristics 2400 ~ 2483.5 MHz wireless band Transmit power + 10dBm Receiving sensitivity -86dBm Antenna PCB antenna Omnidirectional polar pattern Frequency Response 80Hz ~ 20kHz Sound delay & lt ; 20ms External 3.5mm TRS mic input interface Built-in 300mAh 3.7V Li-ion battery Battery life 5 hours Receiver / transmitter dimensions 39 x 22 x 55 mm