This product is used in conjunction with the alarm, the main function of the fishing line will be pressed on the alarm roller, whether the fish bites the hook line or the loop, the alarm can work normally, the product does not light up when it is in standby, and flashes when fishing Designed with weight iron. You can slide it on the beam to change the weight. Adjustable clip, won't fray fishing line. When the fish is hooked, it will signal you. Material: ABS+Iron Product color: yellow Item Length: 245nn Color: as pictured Quantity: 1 piece Note: 1. Please allow 1-3cm error due to manual measurement. Make sure you don't mind before bidding. 2. Due to the difference of different monitors, the picture may not reflect the actual color of the item. thanks The package includes: 1 x Alarm Hanger Rocker (No Retail Package)