The E351 series has been designed with the needs of users on the go in mind. Silicone ear tips reduce ambient noise, contributing to a better bass level and making the listening experience more vibrant. Additionally, they are very comfortable and suitable for extended use. These lightweight and comfortable headphones are equipped with a high-quality copper cable and a gold-plated 3.5mm plug, delivering maximum sound quality across the entire frequency range. The ear tip sizes are S/M/L. Frequency range is 10 Hz - 20 kHz, impedance is 32 Ohms, sensitivity is 104 dB/mW, power is 15 mW, cable length is 1.3 m with a 3.5 mm stereo plug, weight is 5 g, bass rating is 10/10, treble rating is 8/10, noise isolation rating is 9/10, and comfort rating is 9/10.