With this seat arch bracket, it is suitable for the to be fixed under the bicycle seat cushion, and the bicycle can be tracked at any time. Suitable for bicycle seat cushion bracket, precision mold manufacturing, simple appearance. Upper and lower two-piece clamping structure, compact structure, no risk of accidental falling off. The shape is hidden, not easy to be found, and integrated with the bicycle, it is difficult to attract the attention of thieves. Manufactured with ABS precision molds, the size is accurate, it not block the signal, the seam is tight, and it is not easy to enter the water. The hidden design is suitable for without abnormal frame volume, waterproof and splash, and can be dry. It is suitable for Bluetooth tracking device. Through this seat bow bracket, it can be fixed under the bicycle seat cushion, and the bicycle can be tracked at any time. Colour:black Material:Aluminum ABS Package Contents: 1 x Cover 1 x Lower cover 2 x Anti-theft bolt 2 x Self-locking nut 1 x Special screwdriver 4 x Gasket Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.