PRODUCT OVERVIEW The Monster S310 Wireless Bluetooth speaker delivers wide dynamics with punchy bass, clarity and detail with no distortion at any level. You can easily connect two S310 speakers together to create left and right channels - combined output delivers powerful stereo sound, great for parties, movies, or music listening. With the included strap, carry the lightweight S310 bluetooth speaker anywhere. Plus a high-efficiency Li-ion battery lets you enjoy up to 24 hours of Pure Monster Sound from a single charge—longer than most ordinary outdoor Bluetooth speakers! A built-in microphone allows you to easily receive and make calls for a truly hands-free experience.  KEY FEATURES True Wireless Stereo Pairing - Connect 2 speakers simultaneously to create discrete left and right chaTrue Wireless Stereo Pairing- Connect 2 speakers simultaneously to create discrete left and right channels, combined output delivers powerful stereo sound. Play Up to 24 Hours - Built-in high-efficiency Lithium-ion battery, let you enjoy up to 24 hours of Pure Monster Sound from a single charge—longer than ordinary outdoor Bluetooth speakers. IPX5 Water Resistance - Monster speaker is made resistant to splash, rain, gentle spray using the IPX5 water resistance technology, therefore it can be used during showers, or by the pool or beach or even rainy riding. Pure Monster Sound - 40 years of Monster sound engineering delivers the impactful music experience possible. Wide dynamics with deep, punchy bass, detailed higher frequencies and no audible distortion. Built-in Microphone - Microphone allows you to easily receive and make calls for a truly hands-free experience - at home or on the go. Micro SD Card Reader - Listen to tunes on the go, anywhere, without a Bluetooth device. Battery - Built-in high-efficiency Li-ion battery, lets you enjoy up to 24 hours of Pure Monster Sound from a single charge longer than ordinary outdoor Bluetooth speakers. Bluetooth - Bluetooth Speakers: 20W True Wireless Stereo Pairing-connect two 20W Monster S310 speakers together through a single device to create independent left and right channels with 40W audio performance Sound effect - 360° stereo sound effect, truly enjoy the surround sound of the cinema, a truly unparalleled listening experience Charging - Long battery life line rechargeable li-ion battery, listen to up 24 hours of continuous music playback at the appropriate volume, so that music can be played non-stop from day to night Effortless Connectivity - Bluetooth 5.0 provides faster Bluetooth connection and greater wireless range Paired - The Monster S310 portable Bluetooth speaker can be paired wirelessly to virtually any Bluetooth equipped device