Number of items: 2 Package includes: 2 x Host, 2 x Instruction Book Product overview Compact posture trainer designed to provide discreet posture reminders during daily activities. Each unit is made from durable ABS and attaches to an adjustable belt for a secure, comfortable fit. The compact dimensions make it easy to wear under clothing or on of light garments. Key benefits Gentle vibration reminders help prompt you to check and adjust posture without interrupting tasks. Ergonomic shape follows the natural curve of the upper back for comfortable, extended wear. Adjustable belt adapts to different body sizes and can be worn during study, work, or travel. Durable ABS construction provides long service life and easy cleaning. Compact size makes it convenient to carry and use anytime and anywhere. Specifications Number of items: 2 Color: Black, adjustable belt Material: ABS Size per unit: 8.00 x 4.00 x 2.00 cm (3.14 x 1.57 x 0.79 in) Package contents: 2 hosts and 2 instruction books How it works The device delivers short vibration alerts to remind the wearer to adjust posture. Vibration alerts cease automatically according to the device settings. The design allows use without disrupting study or work. Typical use scenarios Student at a desk: Wear under clothing while studying to receive gentle reminders to sit more upright. Office worker: Use during long periods at a computer to encourage regular posture checks without interrupting workflow. Commuting and travel: Lightweight and compact for use on public transport or during travel to help maintain a consistent posture routine. What is included Two posture trainer units and two instruction books. Instructions describe basic fitting, belt adjustment, and vibration alert settings. Notes This product is a posture reminder device intended for everyday use. Follow the included instructions for correct attachment and operation.