Product material: cotton and PP plastic Current or voltage: 5V or 2A Heating method: USB (power bank or mobile phone charging head available) Heating gear: hot compress 45-55-65 three-speed temperature adjustment Height speed: 5-speed height adjustment at the front Supported packaging size: 25x195x22cm Default packaging method: non-woven bag Product net weight: 420g Product gross weight: 440g Product list: Neck brace setx1, USB cablex1, English instruction manualx1 Features: detachable, adjustable, fixed heat Traction, up to 60 percent of traction is used for cervical lordosis correction, straightening, recurvature, cervical spinal canal hyperplasia, stenosis pain, etc. Hot compress can promote blood circulation, help remove moisture and inflammation in cervical vertebrae, nerve roots, joint capsules, muscles and other tissues, prevent various heart diseases in middle-aged and elderly people, protect the sensitive parts of the front of the neck from compression, and adjust traction and fixation.