This fishing bite alarm with LED indicator is very sensitive to fish which swallows the bait, it sounds loud so you can walk away or 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 -Transmitter Low 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. -Receiver Over 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) -Transmitter Work volt: 9v Work current: 30mA Standby current: 0.15mA Off current: 6uA Work frequency: 433.92MHZ Modulate mode: ASK Transmission range: >100M Work temperature: -30C-70C -Receiver Work volt: 9 v Work current: 30mA Standby current: 2.5mA Off current: 3uA Work frequency: 433.92MHZ Modulate mode: ASK Receive sensitivity: -110dbm Work temperature: -30C-70C Box size: 32 * 22 * 6cm / 12.5 * 8.6 * 2.3in Package weight: 742-971g / 1.6-2.1lb Package list: 1 * Receiver 3 * Transmitter 1 * User Manual (English) 1 * Storage Box