Hardware : Button : Reset button Indicator LED : System LED Adapter Input : 100-240VAC, 50/60Hz, 0.3A Adapter Output : 9.0V/0.6A (DC Power) Dimensions (W x D x H) : 5.6 x 4.1 x 2.5 in. (142.3 x 103.4 x 64.3 mm) Audio : Audio Communication : 2-way audio Audio Input & Output: Built-in microphone and speaker