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It works only via USB to PC because that is not only the way to transfer MP3 files from your PC to the player/headphones, but one way to charge the player's battery. You can also charge the player with the USB cable by plugging it in a USB wall charger. So let it fully charge in the PC or the wall charger and then take it with you while you walk, work out, etc. There is nothing wrong with your player (maybe the fact that there is no indicator when it is charging and when it is fully charged ??).
I see lots of people have trouble with their batteries for their various USB connected devices. Unfortunately you cannot usually charge a totally flat battery, or even a 1/2 charged one... from the USB port. These are only used to "Top Up" the battery... & keep it charged up via a "Trickle Charge". at very low current.If your battery is in this condition then you need to replace it with a fully charged one, and then use the USB to keep it fully charged.Another way is to connect the "Flat" battery up to a power supply or machine that charges them, at the right Voltage (Usually 3 - 6 V) & Current rating, and once fully charged, then use the USB.
Your bluetooth headset is powered by an internal battery. If the battery is not charged,it just won't turn on. Fully charge your battery before use.
Make sure that the power outlet you're using is working and that the cord is fitted correctly into the wall, PC or Car outlet and the Jabra Bluetooth device.
Try unplugging the Jabra Bluetooth device and see if it turns on. If so, use the Jabra Bluetooth device until the battery is completely exhausted. The next time you charge it, check that it is charging properly
If the Jabra Bluetooth device is still not charging, check what happens when you initially plug the Bluetooth device into its charger. If the light on the Bluetooth device flashes on and then off again quickly, it is likely that the battery is no longer working. Batteries cannot be replaced or covered warranty
You may need to change your output sound device. The method may vary depending on your software and hardware, but go to Start -> Control Panel -> Sound (I think. Doing this from memory, so might be slightly off). There should be a Devices or Output tab. Change that to your bluetooth headset. You will probably need to restart WMP before you hear music, too.
• At your computer Right click on the Bluetooth icon on the task bar. • Select “Explore my Bluetooth places”. • Click on “View devices in range” to see all available devices. • Right click on the Jabra BT620s and select “Pair device”. • Enter the four digit passkey: 0000 (4 zeros). • Right click on the Jabra BT620s and select “connect”. • The connection will be established automatically, otherwise if the Jabra BT620s is ringing, press the answer/end button to confirm the connection.