performance parameter Host part Serial number specifications parameter Serial number specifications parameter 1 Transmission frequency 433MHz 11 Rated power 1.125W 2 standby power 225mW 12 volume 15Adjustable level CNC 3 Key mode Mechanical buttons 13 parameter 2W8Ω 4 Digital tube 3group2digit 14 Power switch   5 ac adapter 12v1ACertified 15 Key value customization   6 Call distance open250About meters 16 Built in battery 550mAh 7 modulation mode amplitude modulationOOK 17 Number of extensions 159 8 Language broadcasting 6Country (England, Germany, France, Spain, Italy, Russia) 18     9     19     10     20     Accessories section Serial number specifications parameter Serial number specifications   1 adapter INPUT:100-240V~50/60Hz 1.0AMAX OUTPUT:DC12V 1A 4     2     5     3     6     Function List Serial number Function items Function Description Remarks 1 F1 mode, can set prompt music, a total of 9 types, 0-8 selectable, default 06 2 F2 mode, cycle display time setting, optional from 0 to 99 seconds, default 0 3 F3 mode, automatic clearing time setting, optional from 0 to 99 seconds/minute, default 0 4 F4 mode, values for code (01~ 9) " ": 0~9, A~F 5 F5 mode, key value definition, initially set to 1, can only be used for button definition of registered numbers 6 F6 mode, set the frequency of music/voice prompts from 0 to 99 times optional, default is 01 7 F7 mode, language settings, six languages optional, default 00 English 8 F8 mode, display group setting, 1 group/2 groups/3 groups, default is 3 groups 9 F9 mode, restore factory settings, revert to default settings parameters, and delete registration information for all extension numbers 10 Volume adjustment (015 levels), volume adjustment (015 levels), press the [UP]/[DOWN] button to adjust the volume up/down