Remote controller, Step3: replace the battery cover, Check batteries poles – LT Security LTD2516HD-C User Manual
Page 15: Check the remaining charge in the batteries, Check ir controller sensor is mask, 4 remote controller

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Digital Video Recorder User Manual
2.4
Remote Controller
It uses two AAA size batteries and works after loading batteries as following:
Step1: Open the battery cover of the Remote Controller
Step2: Place batteries. Please take care the polarity (+ and -)
Step3: Replace the battery cover
Notice: Frequently defect checking as following
1. Check batteries poles
2. Check the remaining charge in the batteries
3. Check IR controller sensor is mask
If it still doesn't work, Please change a new remote controller to try, or contact your dealers
The interface of remote controller is shown in Fig2.8 Remote Controller.
Fig 2.8 Remote Controller
Item
Name
Function
1
Power Button
Soft switch off to stop firmware running. Do it before power off.
2
INFOR Button
Get information about the DVR like firmware version, HDD information
3
REC Button
To record manually
4
Digital Button
Input digital or choose camera