Type:Neck-mounted type Bluetooth version: Bluetooth V5.3 Function: Call function, voice control, music support, digital display screen Material: Plastic Color:Black/Green/Blue Unilateral line length Size:About 12cm(4.72in) Battery endurance: Over 8 hours Communication distance: Barrier Free 10 meters Packing:1pc Earphone Specifications: It is comfortable to wear this earphone because it is flexible and ergonomic. This earphone adopts large-capacity battery, which features long standby time. Support TF card mode:Bluetooth neck strap headset can also enjoy thousands of music or e-books on the memory card. It can effectively save mobile phone power (note: wireless neck strap headphones do not include TF cards). Note: 1. Please allow 1-2CM(0.39-0.79in) differs due to manual measurement. 2. Real color may slightly different from pictures due to computer screen's resolution, brightness, contrast etc. Hope understanding. Have a nice shopping day!