... require no amplifier! They plug directly into your headset-ready telephone! What's in the box: Headset shown above, plus a ... , 4620, 4621 5410, 5420 5610, 5620 DT1, DT3, DT5 Cable & Wireless: CWB 100H, CWB 200H, CWB 500, CWB 600 Comdial: 8312 ... Phone and 48-Key Digital Feature Phones General Electric: GE Telephone Model 2-9451, 2-9490 GrandStream IP Phones: Budgetone 101 ...