Up to how many MBLMetaWear sensors can be connected to a single app?

a) I would like to know up to how many Meta Wear CPRO sensor can I use with one single iOS App. 
b) Is there a performance relevance depending on the number of sensors connected?

    // Initialize scan

    [[MBLMetaWearManager sharedManager] startScanForMetaWearsWithHandler:^(NSArray *array) {

        [[MBLMetaWearManager sharedManager] stopScan];


        deviceA = [array objectAtIndex:0];

deviceB = [array objectAtIndex:1];

deviceC = [array objectAtIndex:2];


deviceN = [array objectAtIndex:n];


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