If the parent unit beeps while the out-of-range image appears on the video display, the connection with the baby unit is lost. Move the parent unit closer to the baby unit. If the parent unit beeps while the battery/power-on light and the battery symbol on the video display flash red, the rechargeable battery of the parent unit is low. Connect the parent unit to the household power to recharge the battery (see chapter 'Preparing for use').
The baby unit may be switched off. Switch on the baby unit.