Well, these are feature-rich headphones :)
1. The headphones can be used as regular wired headphones - without using the battery. The cable is a standard 3.5 jack cable, so you can use any other cable as well. These are very sensitive headphones, they got pretty loud even from Samsung Galaxy S2 phone. In order to get TBSE1's reasonable loud after these I needed to boost volume by 30%, if not more.
2. The headphones can be used as BT headphones, with mobile phone or computer. Pairing with Nexus 5 and SGS2 was pretty easy - after holding the power button till the blue indicator light steady I did scan of available devices - found "H" device and that's it. No pass-code. The manual says they have 10 meter range - I believe they do.
3. The headphones has built in microphone for conducting hands free calls. I tested that function - it works. The recipient on the other side could not tell that I am not speaking directly from the headset. Note that they have a very long runtimes.
4. Music sharing. A very interesting option, that I actually think will be used by the headphones owners. You can connect another pair of headphones to HT's headphone jack, and share the music that the HT's are receiving via Bluetooth. The volume buttons adjust volume for two pairs of headphones in such setup. Note that you can use this feature to connect also a non-Bluetooth receiver wireless to a Bluetooth device.