ZOOM Handy Control & Sync is an app that can be used to control multipul compatible ZOOM recorders.
Up to 10 can be connected, and those recorders can have their dates and times synchronized and be controlled for simultaneous recording.
Furthermore, this app can be used to monitor input signal level meters, battery charges and remaining recording times.
Files recorded by multiple recorders connected to ZOOM Handy Control & Sync will include Synchronized timecode, which is useful in post-production using those files.

A dedicated BTA-1 wireless adapter might need to be installed in a recorder in order to connect it with this app.

For details about supported products and the use of this app, see the following.
www.zoomcorp.com