Portable wireless Bluetooth mini speaker with IPX7 waterproof rating for outdoor use. Bluetooth version 4.2 for easy pairing with your smartphone, tablet, laptop, or computer. Built-in microphone for hands-free calls. 53mm full rare-earth high magnetic speaker for clear, high-pitched sound and vigorous bass. Rechargeable lithium battery providing 6-7 hours of playtime at 70% volume. Line-in for MP3 songs with a 3.5mm AUX input for universal audio compatibility. Wireless range: Up to 32.8 feet. Frequency response: 68Hz - 12kHz for optimal sound quality. Charging time: 3 - 3.5 hours, with 5V/1A charging current.