High acoustic sensitivity for exceptional performance. Tunable diaphragm: hear high or low frequency sounds by slightly adjusting pressure on the chestpiece. Single-lumen tubing: Detect normal and abnormal sounds and rhythms. Next-generation tubing lasts longer and resists stains. Headset is easily adjusted for individual fit and comfort. Five-year International warranty provides greater peace of mind. Dark Olive Green tube colour with a Smoke finish chest-piece. Package contains an extra pair of soft sealing ear-tips and a non chill sleeve.