Sonotrax Basic A Doppler (w o Probe) Positioners Seats Standers 5 (closed) * Product weight: 10883 5 (closed) * Product weight: 39 lbs * Carton shipping weight: 44 lbs * Weight Capacity: 350 lbs * Notice to California Consumers: WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm * Also available as a pair here) Ultrasonic Pocket Doppler * Easy to use * Compact design * Interchangeable waterproof probe (sold separately) * Built in audio recorder * Large backlight LCD display * Accurate FHR detection with high fidelity sound effect * Support waterproof probes for both obstetrical and vascular usage * Auto Average and Manual working modes * Various power supply solutions * Automatic power off to save power * 9V alkaline battery