The Panasonic RP-HJE120-V in-ear headphones come in a variety of colors designed to be compatible with the iPod nano fifth generation. They are made with an ergo-fit design for ultimate comfort and fit. Moreover, the earpads for the Panasonic headphones are incredibly soft and come in three sizes that include small, medium, and large, designed for a personalized fit. The neodymium driver for the Panasonic RP-HJE120-V is 0.35 inches (9 mm) and delivers a rich and powerful sound with superior highs and deep bass. The in-ear headphones offer a sensitivity of 96 dB, a frequency response of 20 Hz to 20,000 Hz, and an impedance of 16 Ohms. The cord is 3.6 feet long and features an L-shaped 3.5 mm plug. The cord slider makes the cord tangle-free and allows the user to manage the headphones easily. The Panasonic headphones are constructed with a lightweight and comfortable design, making them ideal to use for an extended period of time. These Panasonic headphones are 2.4 inches long by 6.3 inches wide by 1.1 inches tall.