NEEWER is a registered trademark. ONLY Authorized seller of NEEWER can sell under NEEWER listings. Specification: *Working Range: Up to 100 meters / 328 feet between receiver and transmitter *Transmitter Size (L x W x H): Approx. 3.5 x 2.4 x 1.8 inch *Receiver Size (L x W x H): Approx. 3.5 x 2.6 x 1 inch *Receiver Switch Setting: High / low volume / off *Material: Plastic Package Contents: *1 x Door Electro Guard Watch Wireless Remote Motion Sensor