Williams Sound EAR 013 Single Mono Earbud Designed for individuals with mild to moderate hearing loss Fits in the outer part of the ear Excellent sound quality 3.5mm mono plug Key FeaturesDesigned for individuals with mild to moderate hearing loss Fits in the outer part of the ear Excellent sound quality 3.5mm mono plug 1m cord monoaural 32 ohm impedance Recommended for FM receivers and select IR receiversSpecificationsPlug: 3.5 mm mono Impedance: 32 Ohms Frequency Range: 20 - 20kHz Max input power: 5mV Sensitivity: 128dB @ 1kHz Driver size: 13 mm Weight: 9g Replacement earpad: EAR 015