ltem description from the seller
[Fit Model] Avaya DECT D3, DECT Industriehandset IH4, Tenovis D3 DECT, TENOVIS IH4, Tenovis Integral D3 Mobile DeTewe Integral D3, OpenPhone 24, OpenPhone 28 Funkwerk D4 Office, DECT FC1Ex, FC1, FC4 Openphone 24 [Part Number] Avaya 4.999 .046.235, 4.999.130.768, 4999046235, DeTewe 4.999.046.235, 4999046235, Openphone 4.999.046.235, 4999046235