Sound Box API
The Sound Box API permits the use of a small portable speaker that is internally linked to the mobile device via software. When your mobile network is connected to the internet and someone credits you for the products or services you purchased, an audio notice on the speaker will notify you that the money has been received.
You can customize the speech notification on the sound box to your regional and comfortable language. The speaker or sound box will notify you of the payment immediately, but it may be delayed by a few seconds due to bad mobile network connectivity or server troubles on either end.