TIGREZY - High quality products and satisfactory customer service at reasonable price Features: Backlit LCD screen with alarm memory function to indicate the maximum alarm level. A loud 85dB alarm and fast flashing red LED will be sent out when danger is detected, providing 24/7 protection. Test/Reset button to check the electronics and verify the proper operation of the device, and to reset during alarm. Sensitive to detect invisible and deadly odorless carbon monoxide in the air, and give quick reaction once danger occurs. 3 * AA batteries (NOT INCLUDED) operated for convenience, low power indication to be replaced at time. It can be quickly installed in your home without the need for an electrician, no wires needed, no hardwired. Specifications: Material: ABS Color: White Static current: