NOTE: This unit may need to update technical data due to improvements, the related changes are without prior notice. Description: Receiver Controls Frequency response: VHF200-280MHz Frequency stability: less than 0.002% Sensitivity: 2/MV Interference ratio: more than 90DB Mirror interference ratio: more than 88DB Signal-to-noise ratio: more than 95DB Audio output: 0-300MV RF Range: 10 to 30 Meter under standard conditions Receive channel: 2 Channels Power supply: AC/100-240V Antenna: Built-in antenna Hand-held Transmitter Controls Carrier frequency: VHF200-280MHz Frequency stability: less than 0.002% RF output power: 10MW Current consumption: less than 25MA Sub-harmonics: less than total harmonic 40DB Standard: Fixed frequency Adapter: 600Ω Single-fingered Battery: 1.5V Comprehensive Data Kinetic energy range: more than 95DB System distortion: (less than 1%, 1 kHz modulation) Frequency response: 50HZ-18KHZ(±3DB) Package Includes: 1 X Fixed receiver 2 X Handheld microphones 1 X 6.5mm audio cable 1 X Adapter 1 X User Manual