Universal Remote Level Bass Control for Car Amplifier Amp Car Audio This is one of the most advanced bass controllers on the market with dual controls. Not only will you get control of your gain but also over your bass frequency. This is great because every song/track sounds completely different (with different frequencies) and its great to be able to maximize your subs output by precisely tuning them at a turn of a the knob. Most radios have crossovers and bass controls built in, but with radio so advanced its hard to be able to access those controls that fast with all that's going on when your driving. So get to it at the touch of a knob. High quality car audio accessories!!! About Payment:We accept Paypal only.If you order in large qty,we accept T/T. About shipping:We send the goods in 1 working day after received your payment.Monday to Friday.(Beijing Time)We ship worldwide,if your country is not in the list,pls contact us freely.We are happy to help you.Normally it takes 7-15 working days for E-packet shipping to US.Some items we ship from US by USPS and it takes 2-5 working days to reach your hand.It takes 30-40 working days for Ecomonic Int'l Shipping to worldwide.For Working days,the weekends are excluded.Pls be enough patient with the shipping time!If you can not wait,you can ask for sending by DHL/FEDEX/UPS,etc,just pay a little more freight. About return:Some times the product may be damaged in transportation or we sent the wrong items to you.Pls send us pictures and you will get refund.Pls don’t leave negative/neutral feedback without contacting us.There will be many ways to solve any problems. Enjoy the shopping in our store!