APP & CUSTOM EQ: W-KING D320 Bluetooth Speakers allow you to customize EQ and adjust sound parameters, creating the audio experience you adore! Choose from 6 EQ presets to explore the perfect sound mode that suits your ears. Through the W-KING APP, you can quickly establish a Bluetooth connection, adjust volume, control light brightness, select playback modes, and access future firmware updates. (Please contact the W-KING support team for machine upgrades, enabling access to the W-KING APP!) IP67 DUSTPROOF & WATERPROOF: The D320 is W-KING's first all-weather IP67 dustproof and waterproof portable outdoor speaker, designed for day-long portability. IP6X can completely prevent dust intrusion, and is not afraid of harsh environments such as dust and heavy rain. IPX7 can be fully submerged in water (up to 1 meter for 30 minutes), and you can easily enjoy music indoors and outdoors. Whether it's a pool party, a beach bash, or a sudden storm, there's always music to accompan