IRIN IN-80 wireless transmission system, equipped with a lithium polymer battery with a maximum operating distance of 30 meters. - Model Name: IN-80 - Brand: IRIN - Wireless Transmission Method: Wireless transmission - Battery Type: Lithium polymer battery - Frequency Band: 2.4GHz - Operating Distance: Up to 30 meters - Dimensions: Receiver: 32.5 x 72.5 x 26.5mm - Included Accessories: Instruction manual, 1/4 inch cable It's in relatively good condition, but it's a used item, so please consider purchasing if you understand this. I'm not good at dealing with people who are overly sensitive, so please understand.