Speaker Port Tube is used to improve the bass response of many types of speakers. There are plenty of types to help you with your vented box design, and carries tubes of every shape and size, including adjustable length ports and flared ports. | These port tubes are a reliable, convenient installation, while at the same time providing a finished, "pro" look to your bass reflex speaker building project. | Normal tubes suffer from nasty turbulence at the entrance and exit of the port, producing unwanted noise and poor sound quality.This port tubes can overcome the situations and you can experience good looks, low distortion, and superior overall sound quality. | Standard mount holes make this tube easier to install than others on the market. | Please check the mountingn size clearly before buying the item.

Upgraded Version: Our Bluetooth AUX adapter receiver. Designed for non-Bluetooth audio systems. It is the perfect solution for your various non-Bluetooth home audio systems or car speakers to achieve the ideal wireless audio. No battery, easy to use, convenient and compact design makes your audio system look smooth and beautiful. A connection range of up to 33 feet allows you to get rid of messy cables and experience wireless music | Plug and Play, Wide Compatibility: no battery, no drive, plug and play. Very suitable for home or car non-Bluetooth audio system and wired headset/TV/PC etc. At the same time, the 3.5mm AUX adapter widely supports all Bluetooth devices (such as: iPhone, iPad, iPod, tablet, Samsung, HTC, Sony and other Andriod smart phones) paired as a hands-free kit. Provide you with high-fidelity wireless stereo music/hands-free calling, Enjoy wireless smart life easily | Excellent performance design: 2-in-1 design is not only a Bluetooth receiver or a Bluetooth transmitter, one device has two uses, making your life more intelligent. The button design allows you to use it conveniently and quickly, and you can easily switch in the transmitter/receive mode to solve your various usage needs. At the same time, just click a button to answer/cancel/end the call so you can drive safely. In addition, it also supports voice navigation of mobile phones | Reliable Quality: With the latest version of V5.0EDR and high-definition audio technology, our Bluetooth receiver transmitter can be connected to the device more stably, and can transmit quickly and reduce noise as well as low latency to ensure excellent stereo effects. Built-in high-definition microphone so you can talk hands-free. CVC noise reduction technology makes your call more clear. Automatic pairing connection function and dual connection, making your music sharing easier | Worry-Free After-Sales: lifetime technical support, never worry about any problems. We are confident in the quality of the Bluetooth receiver transmitter and are willing to provide a 12-month replacement warranty and a 30-day unconditional refund. If you have any questions, please contact our customer support, we will provide you with a fast and enthusiastic solution at the first time