The Whistler XTR-445 offers a new and improved Red OLED Text Display that provides better contrast, brightness and color. Shows alerts detected, engaged modes and digital signal strength in text format (i.e. highway or ka9).The Traffic Flow Signal Rejection (TFSR) helps eliminate alerts from radar based traffic flow sensors. The XTR-445 is Battery Operated and houses rechargeable NiMH batteries that provide hours of use without the need for a power cord. Get a full list of the XTR-445 features below.