Stable Audio Transmission High-gain Laser Direct Structuring (LDS) antennas. Environmental noise cancellation minimizes frequency interference for improved vocal clarity. The LARK M2 captures 24-bit, 48 kHz audio with a 70 dB signal-to-noise ratio and 115 dB SPL. Clip-On Transmitter Units The transmitter features a dual-interference design with a metallic mesh that protects against dust and 2.4 GHz, infrared, and RFI interference. Easily attach the transmitter with its omnidirectional microphone to your subject of choice using the included magnetic back clips or the silicone necklace cases. . Long Battery Life, Charging Case The transmitters feature a 90mAh internal battery with a 10-hour battery life. The camera-mount receiver features a 145mAh internal battery with a 9-hour battery life. Its 1950mAh internal battery can recharge the entire system three times for a total battery life of 40 hours.