Features: -Transmitter Adjustable sensitivity, volume, tone and LED color. Press V for 5 seconds for On/Off. 7 changeable LED color bite alarm. Press button S for 5 seconds to change LED light color. 256 variable code enough to prevent interference from another angler. LED alarming signals with high output speaker. High visibility LED latching about 30 seconds. Built-in jack for your illuminated swinger of 2.5mm plug. Powered by a 9v battery(not included). -Receiver Over 100m transmission range. 3/4/6 different color LED light to match 3/4/6 different alarms. On/off, adjustable volume, vibration button. Vibration, LED alarming signals with high output speaker. Memory LED. Removable antenna. Powered by a 9v battery(not included). Portable zipper padded case stores all contents,convenient to carry around. Specifications: Model: JY-39 / JY-39-3 / JY-39-6 (optional) Material: ABS & Copper Bite alarm size: 9.5 * 4cm / 3.7 * 1.5in Receiver size: 7.5 * 4cm / 2.9 * 1.5in Zippered case size: 33 * 22 * 6cm / 12.9 * 8.6 * 2.3in Package weight: Approx.609.7-763.5g / 1.3-1.7lb Package List: 4 * Fishing Bite Alarms 1 * Receiver 1 * User Manual(English) 1 * Case