The sound is surprisingly good for such a cheap headset. The volume is sufficient, which does not reach the deleyCON Bluetooth headset to the Philips SBC HD1505U, which is in my opinion the best wireless headphones, I know.
Phone conversations I have not so much with the deleyCON Bluetooth Headset (only for testing purposes 2 calls). In the test calls I have tried both sides (ie, once the "mobile phone with Bluetooth Headset deleyCON" page - and even on the fixed network side with a cordless DECT telephone). On the side of the Bluetooth Headset deleyCON the interlocutor's good to hear. On the opposite side, ie the DECT landline phone the caller is also good to hear, however, is a slight noise to fortuitous (which is not so bad). Compared with the Plantronics Voyager Pro Bluetooth headset for making calls but my favorite is clearly the Plantronics Voyager Pro Bluetooth Headset.
Connecting via Bluetoothzu for Samsung Galaxy Note 2 (N7100) and the Samsung Galaxy Note 10.1 (N8000) succeeded at first.
The battery range will get at the promised time. These things I have not stopped, but I hear for several hours of music and it runs and runs and runs ... .. ..
The build quality seems to me well.
Thus, a strong buy recommendation on the go.