Provides exceptional performance at an excellent value * Used for the assessment of peripheral vascular disease * Boasting superb sensitivity complete interchangeability and high durability the SD3 series is the ideal choice for routine fetal heart rate detection * Its portability allows for the effective assessment of both venous and arterial diseases * Designed for auscultation (intermittent listening) of fetal sound the SD3 uses a 2 MHz or 3 MHz waterproof probe suitable for detecting fetal heart rate or a 4 MHz 5 MHz or 8 MHz probe for vascular diagnosis * Compact design with easy one-hand operation * 2 MHz probe allows for deep penetration for later pregnancy * 3 MHz probe detects fetal heartbeat as early as 9 weeks * 3 AA batteries (not included) for easy replacements * Real-time work mode for spot check * Built-in speaker with adjustable volume * Option to record & play with audio playback and numeric display * Included accessories: carry case & rechargeable lithium polymer battery (900mAh) *