The FM transmitter is designed to operate non-stop 24/7.The higher you position the antenna the further you pass. Connect your audio source to the Stereo FM transmitter using one of the included audio cables. Select an unused FM transmitter in your area (The station can be completely static or with some bleed about it. The Stereo FM transmitter should have no problem running over a radio station bleed over). Set the Stereo FM transmitter to that unused FM transmitter (use the control panel buttons, frequency step: 100 kHz). To start broadcasting turn on the Stereo Fm transmitter by pressing the switch on the front of the unit.Apply any FM Radio to the signal that your are broadcasting on.Listen and Enjoy, It's just that easy! Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the , the Philippines,Taiwan and so on. Voltage: AC110V Specifications: Working voltage: DC 12 V, 2A. Frequency domain: 76-108 Mhz. Frequency stability: + -10PPM. Stepped frequency: 100 kHz. The operating temperature of the environment: -10 to 45 Degrees Celsius. Output impedance: 50 ohms. Input connectors: 3.5mm Mini phone. RF power range: H: 0.5 W, L: 0.1 W. Harmonic and noise radiation: -60dB. Audio distortion: 0.3%. Frequency Response: 50Hz to 15000Hz. Reemphasis delay: 50us. Degree of separation: 35dB. Input level: 15dB. Modulation frequency deviation: + -75 KHZ. (Signal to Noise Ratio):60dB. color:Black Material: Aluminum Alloy Size:113x88x39mm Due to different product batches, the appearance , but it not affect the use Package Contents: 1 x FM Transmitter Radio 1 x US plug 1 x antenna 1 x AV cable 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.