Features: The Micro Transmitter allows you to wirelessly transmit sound from your devices toradio. Perfect for car stereosand home soundsystems. With an adjustable frequency , this mini interceptor ensures clear and uninterrupted transmission. Take control of your sound experience with the Ruiqas Micro Transmitter. Its compact size and easy installation make it a must have accessory for anyone looking to enhances their sound setup Operating Voltage: 0.7V - 9V;Frequency Adjustment from 88MHZ to 108MHZ Transmission Distance: 9V work when using the 70cm antenna conductors, open the local firing range50-100meters, the actual situation depends on the environment Specifications: Operating voltage: 0.7V - 9V Frequency adjustment: 68-108MHZ Transmission Distance: 9V work when using the 70cm antenna conductors, open the local firing range50-100meters, the actual situation depends on the environment Main Color:Green(As The Picture Shows) Original Box:No RelationsWorking voltage (volts) and supply current and transmit power is as follows: 9V, 24mA, 10.2dBm (that is, 11mW) 8V, 21mA, 9.5dBm 7V, 19mA, 8.5dBm 6V, 17mA, 7.1dBm 5V, 14mA, 6.1dBm (about 5mW) 4V, 12mA, 4.5dBm 3V, 9mA, 2.2dBm 2V, 6mA, -1dBm (about 1milliwatt) 1.5V, 4.2mA, -4dBm (about 0.5mW, the average family environment launchsufficient, small green radiation!) 1V, 2.4mA, -9dBm 0.7V, 0.9mA, -20dBm (that is 0.01mW) 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! Package includes: 1PC 0.7-9V 88MHZ-108MHZ FM Transmitter Module Board