Grandstream Networks DP730. Product type: IP Phone, Product colour: Black, Grey, Handset type: Wireless handset. Maximum indoor range: 50 m, Maximum outdoor range: 400 m. Lines quantity: 10 lines. Display: TFT, Display diagonal: 6.1 cm (2.4"), Display resolution: 240 x 320 pixels. Voice codecs: G.711alaw, G.711ulaw, G.722, G.723.1, G.729A, G.729B, OPUS, iLBC