Sonotrax Basic A Doppler (w o Probe) Positioners Seats Standers 2A Ampere hours * Charger rated Style:Right Ear 2A Ampere hours * Charger rated input 100 240Vac 50 60Hz * Charger rated output 27 Comfortable cushioned seat and backrest * Tool free assembly of back legs and arm * New pinch free cover allows for push pins to be depressed without pinching fingers * A frame construction provides stability * Height adjusts in ´ increments with unique Dual Column extension legs * 400 lb 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