This FM stereo transmitter that can be used for factories, schools, supermarkets, farms, Office space or create your own radio station. Equipment using advanced modulation system and built-in PLL frequency, audio pre-emphasis, limiter, and low-pass filter circuit. The Control circuit board design and amplifier design to reduce noise, so sound quality is even better. Well-shielded, compact structure, small size, generous appearance, plug and play, very easy to use. Note:Due to different production batches, there are differences in appearance label printing, which not affect the use. 1. Power Output:1 or 7 Watt 2. FM Transmitter Frequencies:76-108Mhz 3. Tuning Step:100Khz or 0.1Mhz 4. Power Supply:12V DC (The current load of power supply should over 2A) 5. Stability of Frequency:0ppm(-10-and50) 6. Frequency Response:100 - 15000Hz 7. Signal to Noise Ratio: 70dB 8. Distortion:Less than 0.5percent 9. Output Impedance:50 ohm Colour:Black Material:aluminum alloy Package Contents: 1 x FM Radio Transmitter 1 x Antenna 1 x Car Charger 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.