Abstract: The present invention relates to a method for activating warranty comprising: providing a warranty activating unit integrated in a product which is a warranty required product; broadcasting a WiFi network with a login name and a login password identical to a login name and a password are defined according to warranty activation procedures; detecting, by the warranty activating unit, a WiFi network with the login name identical to the login name is defined according to the warranty activation procedures, when the warranty required product is powered on but its warranty has not been successfully activated, and the warranty activating unit automatically connects with the WiFi network to send a warranty activation request information to the server which is a server with a warranty activation function via the internet; the server activates a warranty and send a successful warranty activation information to the warranty required product.

Abstract: The present invention relates to a device for measuring resistance and internal resistance using resonant oscillation comprising: an output resonant oscillating unit having an output connectors connected to a target object to be measured resistance or internal resistance to form a closed circuit and causing the resonant oscillation in the closed circuit; an inductive pulse generating unit for generating inductive pulses according to a pulse frequency, so that generating an output induced current in the closed circuit; and a measurement unit. While there is an output induced current appeared in the output resonant oscillating unit will generate a measurement inductive current in the measurement unit and measured and calculated to determine the resistance value of the target object to be measured resistance or internal resistance.