The Osaki OS-Monarch Zero Gravity massage chair is a top-of-the-line model that offers a wide range of features and benefits. The chair's zero-gravity function helps to align and relieve lower back pain, while the L-track roller system massages the neck, back, and legs. Additionally, the chair includes two heating pads for added relaxation, as well as three rollers on the bottom of the feet. The Bluetooth feature allows you to listen to music or take phone calls, and the USB port lets you charge your devices. The Osaki OS-Monarch Zero Gravity massage chair is an excellent choice for those looking for a high-quality, full-body massage experience.