RGB Lights: This speaker has built-in multi-color light effects. When the volume is above 70%, the lights sync with the music, offering you a more exciting visual effect. TWS Pairing: With TWS technology, you can connect two EDUPLINK Waterproof Portable Bluetooth Speakers together, achieving a stereo sound effect, enhancing the music experience. 20-Hour Playtime: The EDUPLINK Waterproof Portable Bluetooth Speaker features an efficient battery that can provide 20 hours of continuous playtime on a single charge, allowing you to enjoy music for extended periods of time.(At Mid volume and turn off the light). Waterproof Design: This speaker features an IPX7-rated waterproof design, making it safe for use at outdoor locations such as the beach or pool, offering you a convenient music experience. High-Fidelity Sound Quality: The EDUPLINK Waterproof Portable Bluetooth Speaker delivers 20 watts of high-definition audio output, allowing your music to be showcased with richer sound quality for a more immersive listening experience.(Note:Don't put this speaker on a rapid charger,.recommend: 5V1A or 5V2A charge adapter.).