Several affordable Bluetooth speakers priced under 100 euros have been reviewed, offering a variety of features to suit different needs, from casual listening to outdoor use. Among the top picks is the Ultimate Ears Wonderboom 4, which is praised for its waterproof design and IP67 certification, making it resistant to dust, water, and even submersion in up to one meter of water for 30 minutes. It boasts a Bluetooth range of 40 meters, 13.5 hours of battery life, and two built-in equalization profiles tailored for outdoor listening and podcasts. Priced around 99 euros, it lacks a dedicated app for managing the speaker, which may be a drawback for users who prefer customization options. The Ultimate Ears MiniRoll is a more compact option, with a diameter of 10 cm and a weight of just 280 grams. It is also waterproof, dustproof, and can float, making it ideal for outdoor or water-related activities. The speaker features a 4.5 cm wide-band driver and a passive radiator for improved sound quality. It offers 12 hours of battery life and is available for between 50 and 70 euros. However, like the Wonderboom 4, it does not come with a dedicated app for advanced settings. The JBL Clip 5 is a newer model in the Clip series, featuring a clip for easy attachment to bags or belts. It has an IP67 rating, a Bluetooth range of up to 10 meters, and is compatible with the JBL app, which allows users to customize the equalizer and disable startup and shutdown sounds. Priced around 100 euros, it provides 7 Watts of power, making it suitable for casual listening but not for high-volume use. For those on a tighter budget, the JBL Go 4 is a smaller, more affordable option priced under 50 euros. It is splash and dust resistant and offers up to 7 hours of battery life. It supports Stereo and Party Boost modes for connecting multiple speakers together, but it lacks a microphone, jack port, and Bluetooth multipoint functionality, which limits its versatility. The Soundcore 2 and 3 from Anker stand out for their long battery life, up to 20 hours, and a durable, brick-like design with rubber coating. The Soundcore 3 offers more power (16 Watts) and USB-C charging but takes about 4 hours to charge fully. The Soundcore 2 is slightly cheaper and uses a micro-USB cable. Both are priced between 45 and 60 euros, making them excellent choices for users prioritizing battery life and portability. The Sony SRS-XB23 is another option, typically priced at 129 euros but occasionally available for under 100 euros. It features wideband speakers and passive radiators, along with Sony’s Clear Audio+ and Extra Bass technologies for enhanced sound quality. With a battery life of up to 12 hours and IP67 certification, it is well-suited for outdoor use. The Sony app is recommended for equalizer adjustments. When choosing a budget Bluetooth speaker, it's important to consider the intended use—whether for outdoor activities, travel, or home listening. These models are generally not designed for deep bass or high volume, and features like microphones and jack ports are often omitted. For users looking for better sound quality and performance, models like the JBL Flip 6 and Yamaha WS-B1A are recommended, even though they may cost more.