Dual-Wavelength Red Light Therapy: This neck wrap adopts 660nm visible red light and 850nm near-infrared light. Red light delivers mild surface warmth, while infrared light reaches deep muscles and joints for soothing relaxation. Rated at 5W power to enhance overall comfort experience. Comfortable & Easy Wearing: Ergonomic curved design fits neck contour perfectly with lightweight unrestricted wear. Soft resilient foam lining ensures cozy touch. Adjustable strap fits neck circumference up to 20 inches. Skin-friendly silicone cover is convenient for daily cleaning. Wireless & Portable Use: Built-in 3000mAh rechargeable battery provides max 390 minutes runtime, 105 minutes under highest gear. Compact and portable, ideal for office work, commute, travel and home relaxation, suitable for people of all ages. Dual App & Button Control: Supports physical button and remote app control. Adjust 4 light modes and 3 intensity levels freely. Auto shutoff in 20 minutes for standalone use, and flexible timing from 5 to 30 minutes available via app. Ideal Practical Gift Choice: FSA and HSA eligible neck relief device. Perfect gift for birthdays, festivals and daily care, bringing soothing comfort to family members and friends.