Grandstream Networks DP725. Product type: IP Phone. Colour of product: Grey. Handset type: Wireless handset. Maximum indoor range: 50 m. Maximum outdoor range: 400 m. Number of lines: 20 lines. Display: TFT. Display diagonal: 4.57 cm (1.8"). Display resolution: 128 x 160 pixels. Voice codecs: AEC, AGC, G.711u, G.722, G.726, G.729A, G.729B, OPUS, iLBC