Holding vest with built-in sensor- Vibrates when held incorrectly- Fully charged in two hoursReduces the risk of back pain!Advanced Features:A posture vest with a sensor that vibrates when posture is incorrect, so you can more easily correct yourself and maintain a healthy posture. In this way, the vest protects against the development of various types of posture errors, and also reduces the risk of problems with back pain, muscle numbness, etc. The vest has a flexible nylon belt that can easily be adjusted in length according to your needs.Specifications:Colour: GreyMaterials: ABS, nylonDimensions: 8 x 7.5 x 1.5 cmBattery: 500 mAh / 3.7 VCharging time: 2hOne package contains:1 Holding vest1 Charging cableCategories: posture vest, sensor, vibration, back pain, relief, color, gray