Features 1、 Specification Specification: Condiiton: 100% Brand New Operating Voltage: 0.7V - 9V Frequency Adjustment Range: 88-108MHZ 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) 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 x 0.7-9V 88MHZ-108MHZ FM Transmitter Module Board Attention: Size may be slight inaccuracy due to different batches of the products, or hand measurement;Color may be little different due to monitors. Please take real product as standard, thanks for your understanding! Package List