Power: sensor 9V battery/receiver 2 AA battery (not included)Transmitter Size (L x W x H): Approx. 3.5 x 2.4 x 1.8 inchReceiver Size (L x W x H): Approx. 3.5 x 2.6 x 1 inchReceiver Switch Setting: High / low volume / offMaterial: PlasticColor: white