SmartOmi via Amazon offers its SmartOmi Halo Sweatproof Bluetooth 4.1 Earphones for $39.99. Coupon code "4R7SQKMS" cuts it to $10. Plus, free shipping applies. They feature the Qualcomm CSR8645 chipset, IPX-4 water resistance, six hours of playback, and inline controls with built-in mic. Deal ends December 31.