Etekcity NFC Bluetooth Receiver, $16 with code 3BJE8X4J

If you have any old speaker systems lying around your house, you can bring them into this decade with Etekcity’s $16 Bluetooth receiver.

Much like the Chromecast Audio, this little dongle plugs into a speaker system via a 3.5mm cable, and lets you stream to it wirelessly from your phone. We’ve seen cheaper products that do similar things, but this one offers NFC for easy pairing to compatible phones, and a class-leading 10 hour battery as well.