Stereo Radio Portable Quick FM Transmitter Durable Practical 3.5mm Aux Support TF Card Broadcast Adapter Low-power For MP3 PC CD Features: 1. Features at portable size, high quality, long broadcasting range and stable performance. 2. Adopt imported high quality electronic components, equipped with special antenna, stable signal, good secrecy, uneasy to be interfered. 3. Support TF card to broadcast mp3 format music; 3.5mm AUX input: transmit music from your smart phone, computer, MP3 or CD player. 4. Designed with Stereo and Mono o output, both line-in and microphone volume is adjustable by pressing the button. 5. Application to tourism, meeting room, campus, driving, teaching stadium, home wireless o, simultaneous interpretation, camping etc. 6. LCD display, backlight function; simple and convenient operation. 7. You can manually adjust the signal strength. Transmission Distance (Diameter): 100m/328ft at 1 or 2 level signal; 300m/984ft at 3 level signal; 500m/1640ft at 4 level signal. Specifications: Frequency: 60MHz ~ 108MHz (adjustable) Frequency Increase: 0.1MHz Frequency Stability: 10PPM Frequency Response: 50Hz ~ 1500Hz Signal to Noise Radio: 60dB Transmit Power: 0.01 / 10 / 100 / 200mW Transmission Distance (Diameter): 100m/328ft at 1 or 2 level signal; 300m/984ft at 3 level signal; 500m/1640ft at 4 level signal Working Hours: 8 / 6 / 5 / 3 h Power: BL-5C Li-lon, 3.7V 1000mAh Charging Time: about 5 hours Support TF Card: Max 32GB Transmitter Size: 85 x 58 x 18mm  Antenna Height: 114.3mm / 4.5inch Package Weight: 217g Package List: 1 x FM Transmitter 1 x 3.5mm o source cable 1 x Lithium battery 1 x Microphone 1 x Charging cable 1 x Manual