Features: 100% brand new and high quality Bluetooth-compatible provides instant pairing and stable transmission without interruptions. The bluetooth-compatible receiver adopts 3.5mm AUX universal design, which can convert wired earphones and wired audio into bluetooth-compatible devices. Ergonomic design makes it painless for long-wear. It can fast and stable transmission without tangling. Using high-quality materials, not easy to damage, no deformation, skin-friendly. Package Includes: Package A:(A/B/C Optional) 1x Bluetooth-compatible Receiver 1x Cable 1x User Manual Package B: 1x Bluetooth-compatible Receiver 1x Black Earphone 1x Cable 1x User Manual Package C: 1x Bluetooth-compatible Receiver 1x Red Earphone 1x Cable 1x User Manual Specifications: Material:ABS Color:Black,Red Size:11x3cm/4.33x1.18in Bluetooth-compatible Version: 5.0 Operating Range: About 33feet Barrier-free Transmission Distance (10meters Barrier-free Transmission Distance ) Playing Time:About 16 hours Charging Port:Micro USB Battery Capacity:230mAh Ipx 5 Waterproof Option Type:Bluetooth-compatible Receiver;Bluetooth-compatible Receiver with Black Earphone;Bluetooth-compatible Receiver with Red Earphone; note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.