Tele Vue T-Ring Adapter for 4x Powermate High Sierra M2 It has 54 digital input/output

It has 54 digital input/output pins (of which 12 can be used as PWM outputs)

Dimensions: 19x21mm

but they also include a thinner allen wrench knob

6) effectively compensates average situations

Not sure which XBee module or accessory is right for you

Tele Vue T-Ring Adapter for 4x Powermate High Sierra M2 It has 54 digital input/outputFor Use with 4x Powermate Requires Camera Specific T Ring The T Ring Adapter for 4x Powermate from Tele Vue is used to attach a DSLR camera to the 4x Powermate. One end of the adapter attaches to the Powermate, and a camera specific T Ring goes on the other end to mount your camera. Packaging Info Package Weight 0. 15 lb Box Dimensions (LxWxH) 3. 0 x 3. 0 x 1. 45" In the Box Tele Vue T Ring Adapter for 4x Powermate Limited Five Year Warranty All