Store +3 Convertible-Style Headphones with Micro-USB 718-0420 $158.95 CAD In stock Quantity: 1 Add to Bag Product Details Brand: Cardionics For use with E-Scope model 718-7710. 718-0420, Convertible-Style Headphone with a micro-USB plug For teaching or a second listener. Headphones are modified with square plug Volume control on central-slider switch. Save this product for later Favorite