You are purchasing a pack of 20 test kits for Benzodiazepines. (BZO) The cut off concentration for these tests is 300ng/mL. Each test is individually wrapped and the expiration date on my current lot is:5/30/2025. I ship very quickly, often times the same day payment is received. If you buy late in the afternoon or in the evening I will ship the following day (excluding Weekends). I ship for free via USPS First Class Mail, you will receive your discreet package usually within 2-3 days from ship date. There are no markings or indications of contents on packaging. This is a PRIVATE LISTING. Your purchase will be anonymous to other EBay users. Please check out my customer feedback before you purchase. I strive to maintain 100% positive feedback by offering high quality tests at a fair price and shipping them at the speed of lightning. Please send any questions you may have. Thank you very much.