Technical information

Maintenance

Your Duet 450 Clock Telephone should be kept free of dust, moisture, high temperature, vibration and should not be exposed to direct sunlight. It should not be used in bathrooms or near water.

Should the case of your clock telephone become soiled, it can be cleaned with a warm (not hot) soapy mild detergent solution and then dried. Stubborn stains can be removed by gently rubbing the area with a very small amount of alcohol on a clean cloth. When cleaning your clock telephone in this way, make sure it is turned off and that the mains power is switched off.

Do not use abrasive cleaners as they can scratch the surface of your clock telephone.

How many phones

can you have?

All items of telephone equipment have a Ringer Equivalence Number (REN), which is used to calculate the number of items that may be connected to any one telephone line. Your Duet 450 Clock Telephone has a REN of 1. A total REN of 4 is allowed. If the total REN of 4 is exceeded, the telephones may not ring. With different telephone types there is no guarantee of ringing, even when the REN is less than 4.

Mains Operation

For your own safety and convenience your Clock Telephone is fitted with a UK BSI standard 3 pin plug with 3 Amp fuse.

If the fuse in the fitted mains plug should fail, replace it with a BS 1362 approved fuse rated at 3 A. Never use the plug without the fuse cover fitted.

Help

No dialling tone

Make sure your telephone line cord is plugged into the phone socket

Phone does not ring

Do you have too many phones in your home? Please see ‘How many phones can you have?’ in this section for details about the number of phones you can use