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 Features

Designed 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 receivers

Specifications
Plug: 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