Easy to install. Portable carrying Long range remote controlling. Transmites up to 100 meters(open air) 64 selectable channels prevent outside interference Transmitter is powered by 12V battery. The receiver is powered by 3*1.5V C batteries. Two sound for choice: Ding-dong and westminster.HS Code: 85318090 Trademark: WTH Model: TH-D28 Origin: China Packing: Blister packaging Min. Order: 500