DEBRA ER-mini Portable Wireless Monitor System Transmitter & Receiver 1. UFH frequency modulation and one-touch pairing prevent crosstalk. 2. Built-in rechargeable lithium battery provides 4 hours of continuous use, suitable for outdoor use. 3. Stable signal reception with zero latency and an effective transmission distance of up to 30 meters. 4. One transmitter can be paired with multiple receivers simultaneously. 5. Includes high-fidelity headphones for noise isolation and clear vocals. 6. The transmitter with 3.5mm port supports connecting to sound cards, mixers, microphones, amplifiers, effects processors, and other devices. Transmitter Specifications Frequency Range: 501-599.5MHz Number of Channels: 16 Oscillator Mode: DSP Chip Frequency Lock Frequency Stability: +-10ppm RF Power: 10dBm Audio Frequency Response: 10-18000Hz Distortion: <=0.5% Battery: 600mAh3.7V Receiver Specifications Frequency Range: 501-599.5MHz Number of Channels: 30 Oscillator Mode: DSP Chip Frequency Lock Frequency Stability: +-10ppm Receiver Sensitivity: -95 to -71dBm Audio Frequency Response: 40-18000Hz Distortion: <=0.5% Signal-to-Noise Ratio: >=90dB Audio Output: 350mV max Packaging Contents: Transmitter x 1 Receiver x 1 Earphones x 1 Type-C Cable x 1 Audio Cable x 1