Description Brand New and High Quality Operating voltage: 0.7V - 9V Frequency adjustment range: 68-108MHZ Transmission Distance: 9V work when using the 70 cm antenna conductors, open the local firing range 50-100 meters, the actual situation depends on the environment Main Color:Green(As The Picture Shows) Original Box:No Relations Working voltage (volts) and supply current (mA) and transmit power (dBm) is as follows: 9V, 24mA, 10.2dBm (that is, 11 mW) 8V, 21 mA, 9.5dBm 7V, 19mA, 8.5dBm 6V, 17mA, 7.1dBm 5V, 14mA, 6.1dBm (about 5 mW) 4V, 12mA, 4.5dBm 3V, 9mA, 2.2dBm 2V, 6mA, -1dBm (about 1 milliwatt) 1.5V, 4.2mA, -4dBm (about 0.5 mW, the average family environment launch sufficient, small green radiation ) 1V, 2.4mA, -9dBm 0.7V, 0.9mA, -20dBm (that is 0.01 mW) Package Includes 1 * 0.7-9V 88MHZ-108MHZ FM Transmitter Module Board Note: No retail package. Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you