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A telephone line current booster augments available line current to an analog, two-wire bridged, ringing telephone line by an additional 30 mA. Boost a phone line with 20 mA of normal available line current to 50 mA with the addition of one of these booster circuits. Choose from single channel, four-channel and eight-channel current boosters. Heighten your commercial phone line's power with a telephone line current booster from Grainger.