The product is a set of 4 Donner DT-04 Clip-on Tuners, suitable for various types of guitars including acoustic, electric, and classical. These tuners have a sleek black design with an LED display for easy reading. Made of durable metal, they are easy to attach and provide accurate tuning for a smooth musical experience. Ideal for musicians of all levels, these clip-on tuners are a convenient and reliable tool for achieving optimal sound quality during performances.