Question: Would like to know if you can use them independently? Charging one while using the other, then switch.
Answer: Yes, they can work independently.
Question: Can I make calls while using any one earbud as single?
Answer: Yes, both earbuds have caller voice
Question: How long is the playback time?
Answer: The earbuds themselves last four hours. You have to alternate buds using the recharge case for continuous use.
Question: Is there a skip song or go back one song feature on these?
Answer: Yes, you can skip a song by pressing and holding the MFB of right earbud for 2s and go back one song by pressing and holding the MFB of left earbud for 2s. You could find these operations in the user manual.
Question: Can these earbuds work with TV or ipod?
Answer: Yes, they can. Take them out from the case to autimatically turn them on or manually turn them on by pressing once on earbuds. And then they will automatically pair to each other. Then find 'T40' on the bluetooth device list and click to connect.