Offers: Ads with a price may include the option to make an offer to the poster. Offers made are non-binding. The poster receives offer details once it is made. The poster may or may not respond to an offer.
Notifications: While making an offer, you can choose to receive a daily notification if more offers are made on the ad. You can choose to not receive these notifications by un-checking the check box.
Source:
http://toronto.kijiji.ca/c-buy-and-sell-computers-NEW-A710-TABLET-ANDROID-4-0-4-7inch-1-5GHz-CAMERA-512MB-RAM-HDMI-W0QQAdIdZ403086265