How much does this cost to the nearest dollar?

Panasonic DECT 6.0 Plus Cordless Phone Handset Accessory Compatible with 2-Line Cordless Phones Series Business telephones, Headset Jack - (Black)
Extra Add-Ons handsets for Features New DECT 6.0 Plus Technology Interference less Communication Increased Clarity / Enhanced Security Wider Range / Network Friendly 1.9GHz Extra Handset / Charger Dedicated for Cordless Phones by the FCC 30% Battery Life Increase Over 5.8GHz 2-Line Operation Caller ID Remote Access Message Playback Individual Erase Control the Greeting MessageAutomatic Noise Reduction Handset Speakerphone Display Backlit Keypad Built In DirectoryHolds up to 600 Names and NumbersCall Block 3-Way ConferencingVolume Control Call Transfer Auto Channel Search Before & During

Price is $57.00
Price: $57.48