LG TONE Free FN7 offers UVnano technology that kills 99.9% of bacteria. According to LG, their studies show that earbuds can contain a host of bacteria. The FN7’s UVnano charging cradle kills almost all bacteria in as little as 10 minutes while charging.

LG TONE Free FN4 on the other hand, features built-in dual microphones. It also features Echo Cancellation and Noise Reduction, which detects and minimizes unwanted noise. The lower microphone positioned at the end of the stem picks up and amplifies voice.
Both LG TONE Free earbuds deliver clear and spatial audio made in collaboration with Meridian. Meridian's Headphone Spatial Processing (HSP) overcomes the challenges of headphone listening such as their compact size and lack of 'crosstalk' between the left and right channels. HSP not only recreates a realistic soundstage that simulates the experience of listening to real loudspeakers, but it also delivers vocals with pristine clarity.
The two TONE Free models are IPX4-rated, meaning they are resistant to water splashes. Battery life is also top-notch. For the FN7, enjoy a total of 21 hours of battery life. Up to seven hours of playback in the earbuds turned on and an extra 14 hours in the cradle — all from one charge. The FN4 gives you a total of 18 hours - 6 hours of playback in the earbuds and an extra 12 hours in the cradle.