Describe Shelf life:2 years Color:black 1.Using small in-ear design, invisible and inconspicuous, it is specially designed for the elderly to enhance self-confidence and comfort. 2.Support wireless Bluetooth connection, dual-ear synchronous transmission, clear and natural sound quality, effectively improve hearing problems, suitable for users who need hearing aids. 3.Equipped with a long-lasting portable charging case, it can easily achieve multiple charging, meet daily use needs, and is simple to operate and convenient for the elderly. 4.Built-in intelligent noise reduction technology, filter environmental noise, highlight human voice dialogue, so that the elderly can hear clearly in noisy environments. 5.A variety of adaptation modes are available, adjust the volume and frequency according to personal hearing conditions, and provide personalized hearing assistance solutions. Comment: 1. The manual measurement tolerance is 2-5g, please do not mind your replacement 2. Due to differences in different displays, the images may not reflect the actual color of the product. Thank you very much