Overview Reviews Product Description Aver Expansion Microphone for ultra-clear voice pickup.Compatible with the VC520 Pro and FONE540 Conference Speakerphone. Product Videos Custom Field Product Reviews (No reviews yet) Write a Review Write a Review × AVER AVer Expansion Microphone for VC520PRO and FONE540 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments