NOS! The SWITCHCRAFT Strobolamp Part No. 699 is a set of three audio units designed specifically for record changers. These strobolamps allow users to check the speed of their record player to ensure optimal performance. Made by the reputable brand Switchcraft, these units are a reliable and high-quality addition to any audio setup. With this product, users can easily monitor and adjust the speed of their record changer to achieve smoother and more efficient operation.