Uniden DRX402A English Owner's Manual - Page 7

 Each of these bases can support up to two DRX402 MULTIRANGETM chargers, including any that were supplied with your phone.  Usually, you can't tell when a handset switches between the base and the charger in the middle of a call, but sometimes, you might notice a brief pause in your conversation. Registering the MULTIRANGETM charger Registering the MULTIRANGETM charger is a separate process from registering the handset. You can use the charger even if the handset is not registered. 1. On the base, open the menu and select Register Handset. 2. On the bottom of the MULTIRANGETM charger, press and hold the registration button until the Link light starts to blink (about 2 seconds). 3. Release the button and wait for the Link light to turn on and steady (this can take about 90 seconds). If the Link light doesn't turn on, disconnect the charger's AC adapter. Wait about ten seconds, then try these steps again. Some important things to remember:  Only register one charger at a time. If more than one charger is in registration mode at the same time, they can interfere with each other. 7