This listing is for 1 brand new never used ReSound SureFit 2 C speaker / Receiver. Side: Left Length: Size 3 Power: Medium Power (MP) . About the Receivers: The SureFit 2 C speakers fit all of the same hearing aids as the original SureFit speakers except the SureFit 2C is thinner and more flexible for a better more comfortable fit and greater on ear stability. These updated models hold the domes on better and can be used with both the older style black domes and the newer style gray domes. These will fit LiNXĀ², Linx3D, Quattro, Key & Enya hearing aids in both the 61 and 62 models.