Item Type: Blood Pressure Model Number: 100S6 II Brand Name: gustala( Best Selling Fetal Doppler Brand) Application: Palm Material: ABS Size: 23.60 x 14.00 x 7.00 cm Commodity Quality Certification: CE Power: 2 AA LR6 alkaline batteries ( not included ) FHR range: 50 - 240 BPM Comprehensive sensitivity: not less than 90 dB Space peak negative pressure: less than 1 MPa Powered Source: Dry Battery