Easy to install. Portable carrying Long range remote controlling. Transmites up to 100 meters(open air) Transmitter is powered by 12V battery. The receiver is powered by 2*1.5V AA batteries. Frequency: 433.92MHZ+(-)150KHZ Nice ding-dong sound.HS Code: 85318090 Trademark: wTH Model: TH-D18 Origin: China Packing: Blister packaging Min. Order: 500