SEAL TIGHT Mid Arm Protector Small Jobst Ultrasheer 15 20 ThighHi Ultrasonic Pocket Doppler * Easy 14804 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 Right Arm Trough * Provides front of hand protection * Black molded heavy duty plastic with black foam padding or imitation lambskin padding * Pre installed Adjustable Height Channel Bracket is armpad height adjustable * Optional strap kit helps keep arm in trough (Item No Small Upper Arm Circumference 7 10 * Protects against water penetration * Forms uniform watertight seal on the arm * Stretches easily over dressing or PICC Line dressing * Resists tearing * Returns to original size after each use * Measure circumference around upper arm