HD 360° Surround Sound: This portable black Bluetooth speaker boasts rich, amazing bass, high volume without audio interruption. Wireless pairing of two speakers combined with high-quality 10W speakers delivers 360° surround sound (single 5W speaker). High frequencies are clear and bright, mid-range is crisp and clean, and low frequencies deliver a surprisingly deep yet powerful sound. It delivers rich audio and boosted bass far beyond its size. Powerful Battery Life Up to 24 Hours: Small size, big capacity. Enjoy uninterrupted music day or night. Meets your all-day needs. Playing at 40% volume when fully charged gives you 24 hours of continuous musical enjoyment. IPX7 Waterproof & Shockproof: Protection against rain, dust, snow, and splashes – listen to your music by the pool, at the beach, in the bathroom, and more. It's also shock and damage resistant. Even if the Bluetooth speaker falls from 1.5m, it will remain intact. Bluetooth 5.0 & Wireless Stereo Pairing: A new generation of Bluetooth 5.0 technology, using A2DP transmission technology, lower power consumption than Bluetooth 4.2, but faster transmission speed, stronger anti-interference ability, more stable signal without delay. Two M7 wireless speakers can be paired for true wireless Bluetooth playback on the left and right channels of both M7 Bluetooth speakers.