CCTV Security tester It can be used for displaying video, controlling PTZ, generating images, ... setting parameters, run and call the preset.Lithium Ion Polymer Batteries(3.7V DC2800mAh), more reliable, and work 9 hours SpecificationMODELST89B-4 ... 2ABattery1 pcs Lithium Ion Polymer Batteries, 3.7V DC2800mAhRechargeable3-4 hours recharging time, work for 15 hoursLow ConsumptionSleeping mode, display ...