Polar m400 disasembly belt + usb + case change. Simple! - YouTube
for Polar M400 Silicone Protective Case Cover, LOKEKE Soft Silicone Protective S | eBay
Polar - Not only a color, but a state of mind! For those of you who fancy a little splash of color to brighten up your day. Polar M400 is now available
for Polar M400 Silicone Protective Case Cover, LOKEKE Soft Silicone Protective S | eBay