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 * Receiver, 3 * Transmitter, 1 * User Manual and 1 * Storage Box -TransmitterLow battery signal.LED alarming signals with high output speaker(drop back with different Tone and green & 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/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 / Style-4 / Style-6 (optional) -TransmitterWork volt: 9vWork current: 30mAStandby current: 0.15mAOff current: 6uAWork frequency: 433.92MHZModulate mode: ASKTransmission range: >100MWork temperature: -30°C-70°C -ReceiverWork volt: 9 vWork current: 30mAStandby current:2.5mAOff current: 3uAWork frequency: 433.92MHZModulate mode: ASKReceive sensitivity: -110dbmWork temperature: -30°C-70°C Box size: 32 * 22 * 6cm / 12.5 * 8.6 * 2.3inPackage weight: 742-971g / 1.6-2.1lb Package list:1 * Receiver3 * Transmitter 1 * User Manual (English)1 * Storage Box