Welcome to our store! 1. FM transmitter, suitable for iPhone/iPod/HTC/MP3/MP4 players and most devices with a 3.5mm audio jack. 2. Built-in 300mAh rechargeable battery for 10 hours of continuous playback. Enjoy your favorite music on the go without any worries. 3. Supports FM last frequency memory function and uses PLL phase-locking technology to ensure stable output in all conditions. 4. Supports hands-free calls via the car stereo speakerphone for safe driving. 5. Built-in digital tube display, easy to read and won't cause distraction in the car. Left and right buttons to adjust the FM frequency, easy to use. Easy to use, simply plug the transmitter into your phone or other device and set the transmitter to the same channel as the car radio. With a range of 15 meters, it's the most powerful transmitter. Features: 1. FM transmitter, suitable for iPhone/iPod/HTC/MP3/MP4 players and most devices with a 3.5mm audio jack. 2. Built-in 300mAh rechargeable battery for 10 hours of continuous playback. Enjoy your favorite music on the go without any worries. 3. Supports FM last frequency memory function and uses PLL phase-locking technology to ensure stable output in all conditions. 4. Supports hands-free calls via the car stereo speakerphone for safe driving. 5. Built-in digital tube display, easy to read and won't cause distraction in the car. Left and right buttons to adjust the FM frequency, easy to use. 6. Suitable for iPhone series/iPod series/Nokia/Ericsson/HTC/Motorola/Dopod/Xiaomi/LeTV, MP3/MP4/MP5, computer, etc. As long as there is a 3.5mm headphone jack. Specifications: - Charging: 5V 1A (4.75V-5.5V 1A ± 10%) - AUX connection: 3.5mm audio jack - FM display: 88.1Hz-107.9Hz - FM connection: same frequency is connected - Audio input: 3.5mm audio jack - Volume adjustment: none - Power switch: ON-OFF switch - Audio output: FM band connection output - Frequency adjustment: press \">\" to increase frequency \"<\" to decrease frequency - Output voltage: 5 ± 0.1 - Vehicle power: ≤600mA - Storage temperature: -20 °C ~ +50 °C - Working temperature: -10 °C ~ +40 °C - Stereo resolution: ≥38dB Package List: - 1 * User Manual - 1 * Charging Cable - 1 * Transmitter Note: Hands-free function is not based on the microphone on this transmitter. The transmitter itself has no microphone. Connect this transmitter to the phone and use the phone's microphone to make a call. Quick connection and operation, as long as the vehicle frequency and the transmitter frequency are the same (do not rule out strong external interference). Use this product to debug multiple frequency points and find the most suitable local channel. The channel should not conflict with the local radio frequency. It is best to choose an empty FM channel. The optimal channel is different in different regions. 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We will do our best to provide you with satisfactory customer service.