In Line Handset Amplifier Designed for people with moderate to profound hearing loss The world's loudest telephone amplifier, the I-IA-40 gives you volume control up to 100 times standard sound level BOOST button maximizes amplification while blocking out feedback and background noise Tone Selector amplifies specific frequency range for sound clarity and distinction between similar sounding words like "chair" and "share" Compatible with most home and office telephones Connects easily between handset and phone base, no wiring involved Compact and portable, take it with you everywhere Battery included Item: D-HA40 (by Ameriphone) Price: $50.99 + Shipping: 10% up to $80, 7% over $80 Back To Shopping