Fanstel St150 Industry Professional Amplified Speakerphone (Single Line) Features: Convention-grade speakerphone – As Much As Eighty Three dB SPL at 20-Inch Up To Fifty Two dB amplification at 120 dB SPL Frequency-specific amplification for each handset & headset Auto-selects the best amplification stage RJ22 & 2.5mm headset ports Fanstel Single Line Business Professional Amplified Speakerphone…