Features: UHF 2×100 Channel Receiver Digital Signal Processor High-fidelity Cartridge Module Infrared Carrier-frequency Synchronization Unique ID Address Super Anti-Jamming Circuit Design Super-low Background Noise Frequency Auto-Search (Search Non-Interference Frequency) Microphones Can be Use with Any Receiver Microphone High-Low Two Type Power Transmitter Scope of Application: Conference, High-Class KTV, Stage Provide with Perfect Switch Noise Deducted Circuit Includes (2) Handheld Mics Portable Rechargeable Battery Microphones Simple Plug-and-Play Operation Perfect for Professional Audio Stage & Studio Performances Directly Connects to Amplifiers, Stereos, Audio Processors, DJ Mixers Used for Home Karaoke, Classroom, Office & Business Applications What's in the Box: Receiver (2) Handheld Microphone Power Adapter (DC 12V,1A) Connecting Line (39.37 -inches) (4) Rechargeable Batteries (NI-MH Battery) (2) Silicone Antiskid (2) Antenna Transmitter Specs: Transmitter Power: 3-8mW Modulation Method: FM Sampling Ratio: 48KHz Delay Time of Audio Transmission: <3ms Battery Voltage: AA1.5V×2 Frequency Response: 30 ~ 20 KHz Receiver Specs: Power Supply: AC100~240V/ 50/60Hz, DC12v Power Consumption: 200mW S/N Ratio: >96 dB Frequency Response: 30 ~ 20 KHz RX Sensitivity: <-94dBm Balance Type: 0~±500mV Mix Type: 0~±300mV Technical Specs: Frequency Range: UHF 510-560MHz Channel: 2 x 100 Frequency Stabilization: ±30ppm Dynamic Range: 90dB Total Harmonic Distortion: 0.5% Frequency Response: 40Hz~20KHz ±3dB Cover Range: 164-262 ft. Battery Type: NI-MH Battery, 1200mAh (Rechargeable) Battery Life: more than 7 Hours Charging Time: 10 Hours Product Dimensions: 8.67'' x 5.31'' x 10.83'' -inches Sold as: 1 Weight: 4.96 lbs.