You are looking at a listing for one Manufacturer Refurbished AWM6527 Audio2000's AWM6527U UHF Dual Channel 100 Selectable Frequency Wireless Microphone with Handheld, UHF Band (660 - 690 Mhz), 100 Selectable Frequency (50 Frequency per Channel) . This has been fully tested. Available in different microphone combinations. Please select your preference above. Available Microphone Combinations: AWM6527UM Two Body pack Transmitters with two Lavalier (lapel) Microphones. AWM6527UH Two Body pack Transmitters with Headset Microphones. AWM6527U** One Body pack Transmitter with Headset Microphone and One Body pack Transmitter with Lapel Microphone Package Including: AWR6527U Receiver Two Microphones (Please choose the combination) AC/DC Adaptor One 1/4" to 1/4" TS cable Batteries (for testing only) Two Independent Volume Control Knobs (One for Each Channel) Automatic Synchronizing the Receiver and Transmitter Frequency through Infrared Signal Two Independent Balanced XLR Outputs and One Mixed Unbalanced ¼" Output UHF Band Frequencies (660-690 MHz) Agile Frequencies with PLL (Phase-Lock Loop) 50 Adjustable Frequencie Please make sure the AC adapter that is provided with the system is being used. Other AC adapters cannot be used because they can be different in specifications. This can provide too little of an energy source where it will not give enough to power the system. Or it can overpower the system to malfunction if its specifications are too high. Increasing the gain can be used to make the microphone more sensitive to picking up audio (your voice). However, it will also be sensitive to picking up all audio. This is including the background noise in your area. And if the volume on your speaker is also high then it will cause feedback. If you feel that your voice cannot be heard then opt to use the volume knobs on the system, mixer, and/or speakers to adjust instead of turning the gain to its maximum sensitivity. Also, if you have two systems then you will want to make sure that both channel A's are on different frequencies so there are no interference issues or sounds. Changing the channel can also help since there are 50 different frequencies on each side of the receiver. The channel/frequency you might be on can be incompatible with your area or even unavailable because it is already in use by another person or organization. A protective film is in place to ensure no scratches occur to the actual LCD screen prior to reaching the customer. Be sure to remove that film for a clear view of the LCD screen and its readings. Payment Currently we only accept Pay Pal. Payment should be submitted with in 15 days of committing to buy otherwise an unpaid claim will automatically be opened after 16 days. Return Policy: After receiving the item, contact seller within: Refund will be given as: Return shipping: 60 days or with in the warranty specified for the product Money back or item exchange (buyer's choice) Buyer pays return shipping We make every effort to correctly describe and depict the items we sell so that the buyer fully understands what he/she is purchasing. Should there be any problems with Product we ask that you notify us within 48 hours of receipt. The Buyer is responsible for the shipping to return the product and we will cover the shipping of the replacement. In case of returning for Money back please note that the shipping is not refundable and a 20% Restocking Fee will apply for Non-Defective returns. Please contact us via email or the manufacturer for your warranty at (805)523-2538. Confirm Shipping Address: Please verify your Pay Pal Shipping Address and inform us of any changes before sending payment. We will ship to the address provided by Pay Pal once payment is received. In case that an Address in Pay Pal is not available, We will ship to the address provided by eBay. Shipping: Shipping is calculated by UPS/USPS based on weight dimensions and your shipping location. Once we have received your order it will be processed & shipped within 1 business days and a tracking number will be sent to the email address you have provided and will also be entered into eBay. Sales Tax: For shipments to California, we are required by State law to collect sales tax of 7.50 %, This will be calculated at checkout. Customer Service: If you need assistance, please contact us with the eBay 'Ask a question' link at the bottom of this listing. We will do our best to reply with in 2 business days. You may also contact us by phone at 805-523-2538. We look forward to serving you! Business Hours Monday –Friday 8-5pm PST Be sure to add me to your favorites list! Sign up for my email newsletters by adding my eBay Store to your Favorites