The Sony SRS-XB100 is a compact Bluetooth speaker, here in blue. A single 46 mm full-range driver with Sony's X-Balanced speaker unit gives clear, balanced sound from a body measuring 95 x 76 x 76 mm and weighing 274 g. It is rated IP67 waterproof and dustproof, so it can be rinsed off and taken to the beach or out on a walk, and the multi-way strap lets you hang it from a bag or handlebar. The built-in battery gives up to 16 hours of playback and charges over USB-C (cable included). It connects over Bluetooth 5.3 to phones, tablets and laptops, supports Google Fast Pair on Android, doubles as a hands-free speakerphone for calls, and two SRS-XB100 speakers can be paired together. Settings are available in the Sony Music Center app for iOS and Android. It is a Bluetooth-only speaker: it has no Wi-Fi, AirPlay or wired audio input.