1. Built-in 3.7v 2000mah li-ion battery, charging time is 120 mins, timing mode is 10 mins, no need to charge when using, more convenient than a traditional wired massager 2. It works with low noise of less than 45 dB, you can use it in your office, or library and talk with your friends when using it. 3. U U-shaped design And Removable Cover - This electric travel neck pillow is made of memory foam in velvet fabric. The perfect U-shaped design can fix the neck, prevent the head from tilting forward, and reduce neck pain when traveling. 4.Three massager modes:1 Kneading vibration; 2 Single kneading; 3 Single vibration How To Use 1. Press the power button 2s, neck massager starts to work, Long-press the power button 2s to power off when you want to close it. 2. Press the “M” button to switch the modes: kneading vibration massage, kneading massage, and vibration massage. 3. Under single kneading Mode, press the "strength" button to increase or decrease the intensity. 4. Under Single vibration mode, press the "strength" button to choose different vibrations, continuous vibration, or tapping vibration.