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Eargo was founded in 2010 by Florent Michel, his son Raphael Michel, and Daniel Shen. The first hearing devices were made available for order in June 2015. The Eargo Plus was introduced in 2017 and in 2018, the Eargo Max was introduced. The Eargo Neo launched in 2019, and in 2020 the Eargo Neo HiFi was launched. Eargo hearing aids are certified Class 1 medical devices. Their design is modeled after the standard fishing fly, with a small speaker surrounded by medical-grade silicone fibers (for which the company uses the trademark Flexi Fibers); the fibers allow natural bass sounds to flow more freely into the ear canal, so that only treble ranges require amplification. The devices come in two sizes and are pre-programmed with four standard profiles. To change the setting, wearers double-tap their ear, and an acoustic switch changes the sound profile. The settings for the devices in each ear can be changed independently. Users can also send their personal audiograms to licensed hearing professionals at Eargo who will custom-calibrate the device for that individual's specific needs. The hearing aids can be charged using a portable charging device that is sold with them, and are designed to hold a charge for up to 16 hours. The charging device itself is designed to last up to a week on a single charge.