Connection adjustment. This device does not charge batteries and operates only when connected. Power via UPS: Insert into any USB port. Long press to open or close. Short press to switch modes. Timer function automatically turns off after 20 minutes. Recommended usage: up to 3 times daily for 15–20 minutes. Initial results may be visible within 3 weeks. Press and hold buttons for power activation, opening, or closing (2-second press). Red and infrared light therapy wrist wrap designed to help relieve finger discomfort. Each LED features one red light (660nm) and one near-infrared light (850nm) diode. Three operating modes: high-density red and infrared, 50% density red and infrared, and pulse mode with 660nm and 850nm wavelengths. Automatically powers off after 20 minutes. Flexible wrist wrap design for comfortable fit. Inner layer made with soft, premium-grade crystal velvet material for enhanced comfort and secure fit.