Specifications:●It is able to convert RS-232 signal to RS-485 balanced differential signal.●It uses a particular pump to gain power from RS-232 signal , without initializing the RS-232 series interface.●This interface converter does this without requiring any AC or DC power.Features:●Condition : Brand New●Color : As The Picture Show Delivery time:Delivery about 10-16 days to USA, ship by USPS from china to USA.Delivery worldwide ship by Singpost post for regular mail.Delivery worldwide ship by China post for registered mail.Delivery about 20-35 days to Canada and Asian countries,Delivery about 30-45 days to European countries, Oceania countriesDelivery about 45-60 days to South American , African countries Order& shipping: 1, Delivery worldwide will be shipped within 48 hours upon receipt of payment.We will ship the goods by Sing post without tracking No., If add tracking No., Add USD3.0 again,ship by china post. 2, If order is more than usd30 , We will pay fee to add the tracking No. of China Post Registered mail , Contact us: 1. If you are dissatisfied for any reason, please do not be quick to leave negative/neutral feedback. We work hard to make sure eCRATER Customer 100% Satisfied and resolve any problem for you. 2. If you are satisfied with the product you received,please leave us positive feedback and 5 scores DSR，We also will give you positive feedback. 3. If you are not satisfied , Please contact us via eCRATER message , We will help you to solve the problem within 24 hours .