The zoom lens includes a first lens group G1 having a negative refracting power, an aperture stop FA, a second lens group G2 having a positive refracting power, and a third lens group G3 having a positive refracting power, which are disposed in order from an object side. A device has a device sync module for each synchronization partner and each device sync module maintains tracking data. The metal portion has a thermal conductivity higher than that of the varistor element body. Detection can include recording images, sounds, speech, geolocation data, etc.