The hearing aids are the well-known Phonak brand, very clean (20 audio channels), model number Phonak B90R. They are the highest channel count produced by Phonak. Their model and all specifications are shown in the pictures below the screen with the registered serial number and the Phonak diagnostic device. They are American used, and their agent in Saudi Arabia is Al-Madina for Hearing. *The hearing aids are rechargeable, saving you the hassle of using batteries. They charge in a very short time, not exceeding two hours during sleep, and last you all day. You can find many videos to learn more about Phonak hearing aids. Please visit me on my WhatsApp. -The hearing aids have a wireless feature that helps coordinate between the right and left hearing aids, understand speech, and identify the direction of sound. There are four categories of Phonak hearing aids, as follows: 1- Category (30): This is the lowest category of hearing aids with the fewest programs. It does not meet all hearing loss requirements. This category is not worth the price, it has 8 channels and is unfortunately the most common in the market. 2- Category (50): This is slightly better than the first category but does not have all the audio features. It has 12 hearing channels. 3- Category (70): Advanced, has most of the audio features but lacks some minor features. It has 16 channels. 4- Category (90): The excellent or very advanced category. This is the highest category in terms of available programs and is considered a revolution in the manufacturing of hearing devices by Phonak. It has 20 audio channels.. **Conclusion**: Do not buy any hearing aids without knowing their specifications, model number, and channel count.