Abstract: A wireless electronic initiation device for a detonator via a shock tube comprises an initiation member for initiation the shock tube and an energy storage for providing initiation energy to said initiation member. The initiation device comprises also a wireless communication device with a receiver for receiving an initiation command in a wireless way from an initiation arrangement. The initiation device comprises also a controller, which is configured to determine said received initiation command and based on said received initiation command configured to activate said initiation member to ignite the detonator initiator (108) by the energy fed from the energy storage.

Abstract: A method and system for providing a feedback on a performance of a karaoke song is provided. Musical data elements of a music track input feed are compared with musical data elements of a performance input feed. Based on the comparison, the feedback on the performance of the karaoke song is generated on a display. Accordingly, lyrical data elements of a music track of the karaoke song and lyrical data elements of the performance are represented on the display. Moreover, differences between the performance and the music track are represented by altering the representation of the lyrical data elements of the performance relative to the representation of the lyrical data elements of the music track on the display.