Dual head Aluminum alloy chest piece
5-way convertible design: large diaphragm, small diaphragm, adult size bell, medium size bell, infant size bell
Spare eartips of 2 different sizes for best comfortable use
Soft ear-plug, PVC protective cover
Dual-leaf spring is more durable and adjusts to different sizes for better fit.
Dual-lumen acoustic tubing decreases sound attenuation and ensures sound quality.
One side for a child, another for adult