Pairing to a Bluetooth headset with ID = 0000 was done without any problem. This is great.
A headset with ID = 1234 couldn't be connected to this product. Seems only ID = 0000 is allowed to be paired.
AC power adapter accepting 100-240V (US/JP type power connector) is attached and EIAJ No.1 type male plug is used to connecto with this product. Hoped to have USB cable to charge the battery.