If you're fed up with the puny sound coming from your phone's built-in speaker, or the less than hi-fi noise coming out of your smartphone dock, it might be time to invest in a wireless music receiver like Nokia swishy offering. Through the wonders of Bluetooth, music receivers can wirelessly connect your smartphone with your beefy hi-fi music system, letting you stream and control tunes from your handset.There's a fair few of these available - the Belkin Bluetooth Music Receiver is a popular budget choice, but we elected to go for the more upmarket Nokia MD-310 receiver, which future-proofs itself to an extent by offering built-in NFC support.The device is Bluetooth 3.0/Advanced Audio Distribution Profile (A2DP) 1.2 and claims a healthy operating range of 100 metres.