Features: This0-0.2w FM transmitter  is a newly designed model featured by portable size,high quality, long broadcasting range and stable performance. It had 4 levels of power output, powered by 1000mah li-on battery. The maximum working time is 12hours at the lowest power level. It has both Stereo and Mono audio output, both line-in and microphone volume is adjustable by press the button on the case. It's very easy to operate, it's specially suitable for application areas like tourism, meeting, campus, driving school teaching, stadium, horse race, sports, and many other areas. We've also designed a high sensitivity FM Receiver to match the transmitter, its sensitivity is even better than Tecsun radios during our tests. Specification: 1. Power supply: BL-5C Li-on battery, 3.7V 1000mAh. 2. Frequency range: 87~108MHz / 76~90MHz (optional). 3. Frequency Stability: ±10PPM. 4. Frequency stepping: 100KHz. 5. RF power output (Level 1/2 /3/4): 0.01mW-10mW-100mW-200mW. 6. Broadcasting range for reference (Level 1/2 /3/4): 10m-100m-300m-500m. 7. Working time (Level 1/2 /3/4): 16h-10h-8h-6h. 8. Battery Charging time: About 5hours, voltage is 5V. 9. Spurious, harmonic radiation: =60 dB. 15. Device Size: 82*60*22mm (extruding part not included). 16. Weight: About 67g (Battery not included). Note: The antenna must install well before turn on the power, otherwise will very easy damage the power amplifier tube. Package included: 1 x 0.2w FM transmitter. 1 x Reverse thread antenna. 1 x Haning Buckle. 1 x Battery. 1 x Car charger. 1 x DC charger. 1 x Charging cable. 1 x Microphone