Summary: The $49.99 Genius SP-900BT offers pretty good audio and a sleek design. The speakerphone capability also comes in handy. However, we're not fans of the automatic volume decrease feature that saves battery life. While it doesn't double as a speakerphone, the Satechi ST-69BTS Audio Cube costs $5 less, and offers better-sounding audio and longer battery life at higher volume. But for less than $50, the SP-900BT is a versatile and long-lasting little speaker.