Feature: -Integrate design for perfect function -Dual-head Dual-barreled ,superior Acoustics -High quality,responsible for every one. -Suitable for doctor , nurse , student , and home health care essential -postable and beautiful design -Solid zinic alloy plated single head， less attenuation -100-500Hz, attenuation less than 12dB -500- 1000Hz , attenuation less than 20dB -Soft-sealing comfortable eartips.
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