Featuring the dB-Mag Roller with 8 magnets and ISM (Intelli-Sense Mode), false indications are eliminated in extreme conditions. The SRT (Sync-connect Receiver Technology) optimizes signal strength, and the Tru-tone cone speaker delivers loud frequency. With a range of advanced features, these alarms are designed to meet the demands of serious anglers. Upgrade your angling experience with Trakker's advanced technology. dB7-R Alarm SetPPS (Power-On Protection System) ISM (Intelli-Sense Mode) dB-Mag Roller with 8 precision magnets Tough ABS weatherproofed case Digital circuitry and internal weatherproofing SRT (Sync-Connect Receiver Technology) Tru-tone cone speaker Dual-descent tone drop-back differential Dual super-bright multi-colour LEDs One-touch night light function Rod-friendly rubber inlay grips Rigid 3/8" stainless steel thread Requires 1 x PP3 9V battery Dimensions: 11 ... More info