Speaker GPA-670BD1 with duo receiver replaces GPA-660

The GPA-670BD1 portable speaker with light and efficient lithium-ion batteries replaces the GPA-660 speaker. The GPA-670BD1 has a built-in duo receiver for the use of two wireless microphones simultaneously. With Bluetooth, AutoTracking and In and Out Line, the GPA-670BD1 is a first-rate speaker.