Massage app is an excellent app to generate vibration in foreground and background. That means you can run other apps when Massage app is generating vibration as a background service. The following is the feature list.1. Generating vibration as a background service.2. Generating vibration in foreground.For more information, please refer to http://www.leaderg.com/app/Massage.phpMaria Massage app is the product of LEADERG Co., Ltd. If you have any question about this product, please send email to us.Thank you!PS: The trial is 20 times. If you like this app, please buy it. Thank you!