Name: BV-520V Vascular Doppler Detector Function: To detect the blood stream status of arterial/venous by 8MHz probe. The 8MHz probe is supplied with the unit. Detects the blood flow average velocity; detect the purpose of finger/toes and part of body’s vein anatomies operation. Technology: In/out power: D.C 9V 1000mA Batteries: 7.4V 900mA Output power: 3W Frequency power; 500mW Led: 20 bit Unit Weight: 300 grams Dimensions: 35 x 55 x 13mm