Yealink W73P. Product type: IP Phone. Colour of product: Grey. Handset type: Wireless handset. Phonebook capacity: 100 entries. Display: TFT. Display diagonal: 4.57 cm (1.8"). Display resolution: 128 x 160 pixels. AC input voltage: 100–240 V. AC input frequency: 50/60 Hz. Input current: 0.2 A. Battery technology: Lithium-Ion (Li-Ion). Battery capacity: 1010 mAh. Battery voltage: 3.7 V