Dual Channel LED Sound Level Meter PPM VU Audio Spectrum Analyzer with Remote Control DC 5V 1A Item Type: Dual Channel LED Sound Level Meter Material: Aluminum Alloy Input and Output Ports: RCA, Approx. 3.5MM Jack Stereo x 2 Groups Each Monitoring Frequency Range: 20~20Khz Input Impedance: 10Kohm Support Audio Signal Source: Computer, Mobile Phone Decoder, CD, DVD, Player (Note: Speaker Output Connected to Power Amplifier and PHONO Output of Phonograph are not Supported) Display Brightness Adjustment: Support, a Total of 4 Levels Remote Control Function: Support Remote Control Battery Type: 1 x CR2025 Button Battery (Delivery Without Battery) Display Length Gain: 3 Levels of Gain Adjustable (-3dB, 0dB, +3dB) (only Adjust the Display Length, does not Affect the Source Audio Signal) Display Mode: Peak Meter PPM (Peak Programme Meter) and VU Meter (Volume Unit) Main Beam, Peak Speed Hold Time Setting: Support Power Off Setting Data Saving: Support Signal Source: LINE IN or Built in Microphone Pickup Power Interface Specification: Micro USB