[. . . ] You will hear a beep and see the message "Power off" on the LCD indicator when the power is off. Also, a warning sound will beep every thirty seconds when the HBM-700 needs to be recharged. [. . . ] Press the"SEND" button for at least 2 seconds in order to redial to the last number dialed Insert at least one-digit number which is registered and press "SEND". But beware that only one Handset can be connected to the Bluetooth device at a time. If you add a 4th Handset, the HBM-700 will automatically remove the registration information of the first stored or the least used Handset. When you want to change the priority of the Handset, try to connect manually from the Handset. Press the "SEND" button briefly in order to answer a second call without hanging up the first call. The phone number is indicated on the LCD indicator when you receive a call. Missed a call A "Missed Call" message appears on the LCD indicator when you have missed a call. Press the "Send" button once more in order to connect to the missed call. This function is available only to Bluetooth Handsets which support caller ID The phone number is indicated on the LCD indicator only when you have registered the Caller ID service. Making a call To make a call, dial the appropriate numbers and press send. Press the clear (CLR) button to erase phone numbers one digit at a time. Press the "SEND" button briefly once more in order to deactivate Voice dialing. The Voice Recognition function is available only to Bluetooth Handsets which support this function. If you have questions regarding Voice Recognition, please refer to your phone instruction guide. [. . . ] The phone frequently cuts off during a phone call Check whether the battery of the HBM-700 is fully Charged Check whether the power of the HBM-700 is on. Unable to use reject call, call waiting, redial or voice recognition Unable to hear caller/dial tone or audio sound Do not place or keep the unit near the flammables. [. . . ]