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Excellent acoustics with better audibility of high-frequency sounds (adult side, firm pressure). Tunable diaphragm: hear high or low frequencies by slightly adjusting the pressure on the chestpiece. DOUBLE LUMEN HOSES Two sound paths in one tube eliminate the friction noise of traditional double tubing. Next generation hose lasts longer and resists contamination; without natural rubber latex or phthalate plasticizers. The ear hooks easily adjust for custom fit and comfort; angled earbuds conform to the ears.