Yealink W57R. Product type: IP telefon. Colour of product: Black. Handset type: Wireless handset. Maximum indoor range: 50 m. Maximum outdoor range: 300 m. Number of lines: 2. Phonebook capacity: 100 entries. Display: TFT. Display diagonal: 4.57 cm (1.8"). Display resolution: 128 x 160 pixels. Frequency range: 100 - 7000 Hz