Sony SRS-XB12 Mini Bluetooth Speaker Loud Extra Bass Portable Wireless Speaker With Bluetooth The small but mighty Sony SRS-XB12 Mini Bluetooth Speaker ($38) has an extra loud bass and is waterproof and dustproof. No matter where you go, this speaker can fit right into your pocket. Image Source: amazon.com Sony SRS-XB12 Mini Bluetooth Speaker $38 from amazon.com Buy Now