This fishing bite alarm with LED indicator is very sensitive to fish which swallows the bait, it sounds loud so you can walk awayor have a rest over one hundred meters, do not worry about missing the hooked fishes and the rod. Features:Include: 1 x Receiver, 3 x Transmitter, 1 x User Manual and 1 x Storage Box -TransmitterLow battery signal.LED alarming signals with high output speaker(drop back with different Tone and green andamp red LED).High visibility LED latching about 40 second memory.Adjustable Sensitivity, Volume, Tone button.Extra plug for swinger(not included).Separate battery compartment. Powered by a 9v battery(not included).Special rubber finished surface.256 variable code enough to prevent interference from another angler. -ReceiverOver 100m transmission range.On or off, Sound, vibration button.4 different color LEDs to match 4 different alarms.Receiver will sounds when received signal, and number indicated on screen.Inside automatic variable code repair function.Separate battery compartment. Powered by a 9v battery(not included). Specification:Model: Style-3 or Style-4 or Style-6 (optional) -TransmitterWork volt: 9vWork current: 30mAStandby current: 0.15mAOff current: 6uAWork frequency: 433.92MHZModulate mode: ASKTransmission range: andgt 100MWork temperature: -30anddeg C-70anddeg C -ReceiverWork volt: 9 vWork current: 30mAStandby current:2.5mAOff current: 3uAWork frequency: 433.92MHZModulate mode: ASKReceive sensitivity: -110dbmWork temperature: -30anddeg C-70anddeg C Box size: 32 x 22 x 6cm or 12.5 x 8.6 x 2.3inPackage weight: 742-971g or 1.6-2.1lb Package list:1 x Receiver3 x Transmitter 1 x User Manual (English)1 x Storage Box