There are 0.3m-1.5m elastic threads, which can be expanded at will. Cable body is made of high resilience TPE, which is anti-tangle and good elasticity.It has built-in antenna design, signal enhancement without lagging, and 10M transmission is available. The adapter supports one to two function, two cell phones switch at will, can share two cell phones music.Made of TPE and metal material, it is durable and portable.The stretching length of the cable is 135cm, the length, width and height of input interface is 1.17cm, 3cm and 0.6cm.After the first successful pairing of cell phone and device, start the car can be automatically connected. The built-in microphone and hands-free amplified call function can keep hands off the steering wheel and make driving safer.Item Name: Bluetooth-compatible AdapterMaterial: Metal,TPEModel: U3Output Interface: 3.5mmTransmission Distance: 10 etersPower Supply Port: USB2.0Frequency Response: 20HZ-20khzSNR: > 90dBBluetooth-compatible Protocol: A2DP, HFPAudio Bluetooth-compatible Version: 5.0Size Details: Stretching Length of Cable: 135cm/53.1" *Approx.) Input Interface Size: 1.17cm x 3cm x 0.6cm/0.5" x 1.2" x 0.2" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Bluetooth-compatible Adapter