Feature: 1. Made of ABS engineering plastic, it is impact-resistant, heat-resistant, low-temperature-resistant, chemical-resistant and has excellent electrical properties. 2. Sensitive central axis roller, captures signals with a light touch. 3. The transmitter has LED flashing and sound alarm, different lights and sounds for line pulling and returning. 4. The receiver operates at a distance of ≥200 meters, with six LED lights automatically corresponding to the color of each transmitter. 5. Both the transmitter and receiver are waterproof, suitable for various weather conditions. Specification: Electronic wireless fishing alarm, making fishing easier and smarter. Features: Made of ABS engineering plastic, it is impact-resistant, heat-resistant, low-temperature-resistant, chemical-resistant and has excellent electrical properties. Sensitive central axis roller, captures signals with a light touch. The transmitter has LED flashing and sound alarm, different lights and sounds for line pulling and returning. The receiver operates at a distance of ≥200 meters, with six LED lights automatically corresponding to the color of each transmitter. Both the transmitter and receiver are waterproof, suitable for various weather conditions. Specification: Material: ABS Weight: 550g/ 19.4oz Transmitter: Operating frequency: 433.92MHZ Voltage: 3-5V Transmission distance: ≥ 100M Current: 30mAh Operating temperature: -30℃-70℃ Battery: 3pcs AAA batteries (not included) Size: 9.5*4*4cm/ 3.7*1.6*1.6in Receiver: Operating frequency: 433.92MHZ Voltage: 9V Receiving sensitivity: -110dbm Current: 30mAh Operating temperature: -30℃-70℃ Battery: 3pcs AAA batteries (not included) Product size: 9*4.5*4.5cm/ 3.5*1.8*1.8in Package list: 1 * receiver 4 * transmitter Package List: 1 * receiver 4 * transmitter