Sony Ult Field 3 Portable Bluetooth Speaker.

Frequency Response: 2.4 GHz Connectivity Technology: Bluetooth Audio Output Mode: Mono Input Voltage: 9 Volts Mounting Type: Free Standing Powerful bass with ULT button to increase bass Compact size with a shoulder strap to carry anywhere Water and dustproof IP66 and IP67 Battery life up to 24 hours Party Connect connects up to 100 speakers of the same model USB Type-C port can be used as a power bank to charge other devices Built-in microphone supports hands-free calling