Product material: cotton + PP plastic Current/voltage: 5V/2A Heating method: USB (power bank/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: 25*195*22cm Default packaging method: non-woven bag Product net weight: 420g Product gross weight: 440g Product list: Neck brace set*1, USB cable*1, English instruction manual*1 Features: detachable, adjustable, fixed heat Traction, up to 60% of traction is used compatible with 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.