Purchased six months ago. I used it for surveying, but I'm selling it because I have fewer opportunities to use it. Number of channels 20ch Battery: Alkaline dry battery AA x 1, or Nickel-metal hydride battery Operation has been confirmed. One unit is almost unused. It can be used for about 1 day with dry batteries. It can communicate about 100 meters even in urban areas. Size: W 47 H 79.9 D 22mm Weight 110g There are scratches, but there is no problem with use. This is a used item, so please consider before buying if you are particular about product condition. Please refrain from returns after purchase. Camping Outdoor Survival game Surveying Site Wireless