How much does this cost to the nearest dollar?

BOSCH SECURITY VIDEO TriTech Motion Detector
The Blue Line Gen2 Series of Motion Detectors use a combination of passive infrared (PIR) and microwave detection technologies with advanced signal processing. The pet-friendly (-WP) models generate alarms for human intruders without generating false alarms for pets. These small unobtrusive detectors are simple to install and do not need field adjustments. Pet-friendly selectable model available Dynamic Temperature Compensation Microwave Noise Adaptive processing-reduce false alarms Dimensions 4.5 x 2.5 x 1.75 inches, Weight 0.24 Pounds, model number Rank Electronics Motion Detectors 916, Is Discontinued No, Available October 13, 2013, Manufacturer BOSCH SECURITY VIDEO, Brand BOSCH SECURITY VIDEO, Power Source Battery

Price is $51.00
Price: $51.02