The New X3200 MK3 features : 1. External micro- USB Power input (Power only, not for charge ) 2. More accuracy 3. More reliability 4. Use 2 of “AA” battery (extend battery using time compare AAA type (MK2 use “AAA”)) 5. High density IR sensor (X3200 MK2(old model): 8 sensors, MK3: 14 sensors) 6. Low cost solution 7. Extend Battery Life Specification 1. Velocity rest range: Initial Velocity measure range: 30.00 ~ 400.0 (m/s) ROF measure range: 100 ~ 5000 (RPM) 2. Chronograph: Support Camera Tripod mount Tube diameter 24mm Battery: 2 x AA batteries External Power input: micro USB (5V/0.5A) (No charge batteries function only power for Chrono) Dimension: L x W x H = 113 x 97 x 55 (mm) Weight: 205g Made in Taiwan