From Meris:

The Meris MIDI I/O allows you to control up to 4 Meris pedals via MIDI. MIDI controller, wireless with a bluetooth adapter, from your DAW, you decide…

• Compact, pedalboard friendly MIDI I/O for up to 4 Meris pedals
• Allows control of all parameters via MIDI
• Supports MIDI input and output from all Meris pedals
• Allows unlimited offline preset saving and loading
• Wireless compatibility with bluetooth MIDI adapter
• MIDI in and out activity status LEDs
• Also compatible with Empress and Chase Bliss* pedals (*requires special cable)
• ** 9V Power supply not included

Dimensions: 3.7” wide, 2.6” deep, 1.5” tall
Weight: 6.4 ounces