Fetal doppler

fetal doppler:
Features:
Safe:ultrasound dosage is under the safe standard
Durable:huge capacity battery,work more than 12 hours after full charge
Convenience:single key control,automatic battery recharge and protection
Sensitivity:FHR of fetus 9 week up
Probes:According to the difference of pregnant week,2.2mhz or 3.3mhz can be choosed
Speaker:Quality SANYO speaker take more clear and loudly
Specification:
Display:highlight  LED,real time FHR display
Ultrasound frequency: 2.2 mhz or 3.3 mhz
Ultrasound intensity:2.5mw/cm2
Probe:waterproof,anti shock anti falling down
Power:AC 220/110,50HZ,DC18V,build in battery
Capacity of battery: 1100mah,continuous working more than 12 hours after full charge
Dimension: 240mm*160mm*115mm
Weight:main body 1.12 kg,charge board:0.64kg