In celebration of pool season, Amazon’s offering all-time low prices on Sony’s new line of Bluetooth speakers, each of which includes IPX5 water resistance, great battery life, and the ability to connect multiple speakers together for room-filling sound. To help you understand the differences though, we’ve broken them all down below.

Sony XB10

The XB10 is basically a standard single-driver Bluetooth speaker, but with a few additional features like NFC pairing, the ability to connect two together for stereo sound, and a 16 hour battery. $48 is an all-time low, and roughly $10 less than usual.

Sony XB20

For $20 more, you get dual drivers (at the cost of battery life, which clocks in at 12 hours here), a single-color lightstrip that accents the speaker, and the ability to connect up to 10 (!!) speakers at once. It typically retails for around $100.

Sony XB30

The XB30 doubles your battery life to 24 hours, and upgrades the light strip to include multiple colors and a strobe feature, all controlled via an app. It usually sells for about $50 more.

Sony XB40

And finally, the XB40 adds additional lighting around the speaker cones, but otherwise seems to be exactly like the XB30. $148 is, amazingly, a ~$100 discount.