button approximately 1.5 seconds to enter FM Tuner Mode.
button to scan
button to scan back through the FM frequencies.
button to enter Preset Program Mode.
and REVERSE 
to cycle through the Preset Numbers [P 
to assign the current FM frequency to the displayed Preset Number.
to return to FM Tuner Mode.
button while in Preset Program mode to cause the RioVolt to scan through the entire FM frequency range and assign all 10 presets to the strongest FM stations.
button to enter FM Preset Navigation Mode.
to move down the preset list. Press PLAY/PAUSE 
to move up the list.
to select a preset.
button exit FM Preset Navigation Mode.
SP350 specifications
The Rio Audio SP350 is a standout portable Bluetooth speaker designed for audio enthusiasts who prioritize sound quality, versatility, and innovative features. This speaker embodies a perfect blend of cutting-edge technology and sleek design, making it an appealing choice for music lovers on the go.One of the SP350's main features is its impressive sound output. Equipped with advanced audio technology, the speaker delivers clear highs, rich mids, and deep bass, ensuring an immersive listening experience. The device utilizes powerful woofers and tweeters to produce a well-balanced audio profile that can fill any space, from an intimate gathering to an outdoor party.
Battery life is another key characteristic of the Rio Audio SP350. With a robust battery, this portable speaker can provide hours of continuous playback on a single charge. This extended battery life is perfect for users who enjoy outdoor activities, such as camping or beach outings, without worrying about frequent recharges. The device also features a quick-charge capability, enabling users to get back to their music faster.
The SP350 employs Bluetooth 5.0 technology, which offers a stable and seamless connection within a range of up to 33 feet. This ensures that users can easily connect their smartphones, tablets, or other Bluetooth-enabled devices without the hassle of tangled wires. Furthermore, the SP350 supports NFC pairing, allowing for quick and intuitive connections with compatible devices.
In terms of design, the Rio Audio SP350 boasts a stylish and durable construction. With an IPX7 waterproof rating, it is resistant to splashes and brief immersions in water, making it suitable for use by the pool or during rainy days. The compact and lightweight design enhances portability, allowing users to take it anywhere without any inconvenience.
Another notable feature is the built-in multi-function microphone, which enables hands-free calling. This feature is especially useful for users who want to take calls without disconnecting from their music or for conference calls on the go. The speaker also incorporates voice assistant compatibility, allowing for added convenience.
Overall, the Rio Audio SP350 stands out as a versatile audio solution that combines advanced audio technologies, impressive battery life, and durable design, making it an excellent choice for anyone looking to enhance their listening experience, whether at home or on the move.