Avoid nuisance and unwanted calls with the BT1700. Block up to 50 specific numbers or use the Do Not Disturb function to silence your calls. The easy-to-use interface and 1.6 inch backlit screen will allow you to get the most out of your phone straight away. Long range reception: Up to 300m outdoors, up to 50m indoors. Battery life provides up to 12 hours talk time, or 120 hours on standby.