Receiver desktop: Frequency : 2.4G Sensitivity: 2/MV Adjacent channel interference ratio: 90DB Mirror interference ratio: 88DB : 95DB Audio output:0-300MV Working range:standard conditions 30 to 50 meters Power supply voltage:DC 12V Antenna: External antenna Launch handheld: Carrier frequency: 2.4g Frequency stability: Less than 0.002% Transmit power: 10MV Current consumption: Less than 25MA Subharmonic: Less than main wave 40DB system: fixed frequency Pickup: 600 single finger battery: recharging Material: plastic colour: black Package Contents: 1 x Transmitter 2 x Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.