I am the original owner. Excellent condition, only used a few times, then got shelved because I took the plunge and bought the JL Audio Max. The AudioControl SA-4100i Measurement Microphone is a high-quality microphone designed specifically for measuring audio levels in vehicles. With the trusted brand of AudioControl, this microphone ensures accurate and reliable readings for your car audio system. The model SA-4100i is known for its performance and durability, making it a valuable tool for audio enthusiasts looking to optimize their vehicle's sound quality.