Rectangular AMPS pattern: 30mm x 38mm (1.181" x 1.496") on center Full range of motion under the electronics: 210 Tilt, 360 Turn & 360 Rotation Ratcheted arm has 140 vertical motion; knob locks arm into place Suction pad is 3.4 (86.4mm) in diameterOverall length is approximately 4.5 (114.3mm)Recommended for electronics weighing up to 3 lbs. (1.4kg)