The Lark M2 transmitter (TX) unit is notably small and lightweight at approximately 9g, designed for discreet attachment with a magnet clip or silicone necklace case. It captures audio in a 48kHz/24-bit format, aiming for high fidelity with a 70dB signal-to-noise ratio and a 115dB maximum SPL. The system includes Environmental Noise Cancellation (ENC), activated with a single button press on the transmitter, to help reduce ambient noise.