Receiver: Frequency range: 180 to 300MHz Receive mode: crystal frequency lock Frequency stability: 15PPM Sensitivity: 3uV 30dB S/N Audio output: 0 to 0.5V/4.7K Dimensions (L x W x H): 326 x 200 x 53mm Power: 90/240V AC (10%) Transmitter: Frequency range: 180 to 300MHz Frequency stability: 15PPM Modulate mode: FM Modulate: depth, 10KHz Emission power: 30mV (maximum) Harmonic suppression: 40dB Battery: 9V x AA Antenna: built in Battery current: 25 to 30mA Dimensions: 247 x 45mm System specifications: Frequency range: 180 to 300MHz Frequency stability: 0.005% Modulate mode: FM Frequency response: 50 to 16000Hz Signal to noise ratio:> 60dB Sound pressure: 120dB (maximum) Distortion factor: 1% Effective field: 30mm Operating temperature: 10 to 5010°C