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High-concerned chemical : None Model Number : pe002 Material : Medical Silicone Product number:101-crypAFEI Origin : Mainland China Number of Pieces : One Unit Item Type : PENIS PUMP Air pump : 370 fully waterproof air barrier membrane + waterproof solenoid valve Barrel height : 20cm Barrel mouth diameter : 6.5cm Silicone ring diameter : 2cm+2.5cm (+0.2cm) Material : silicone+ABS Working voltage : 3.7V Charging time : 2.5 hours Working time : 2-2.5 hours Charging : USB magnetic charging Noise : less than 60db Certification : CE ROHS FCC 1 : penis pump 2 : penis extender 3 : electric penis pump 4 : Male enlarger 5 : vacuum pump