10pcs Round Pagers Restaurant Pager System Wireless Pager Set with Vibration Beeping LED Flashing 100‑240V for Restaurant Bar US Plug Item Type: Restaurant Pager System Weight: 1536g / 54.18oz Material: ABS Keyboard Size: Approx. 12x7.5x2cm / 4.7x3.0x0.8in Pager Size: Approx. 11x11x1.5cm / 4.3x4.3x0.6in Receiving Frequency: AM315MHz, FM433MHZ Receiving Sensitivity: -120dB Battery: DC3.7V lithium ion battery 300mAh (receiver shipped with built in battery) Standby Time: About 30 hours Protection Class: IP67 Number of Extensions: 10 Setting Method: Self learning code Prompt Way: Vibration, beeping, LED flashing light How e:1.1. After the keyboard is powered on, the screen standby display for this keyboard ID number. 1.2. The extension is charged for 20 minutes to set the operation, power on please note the power specifications! 2.1. [F1] Keyboard ID setting 2.1.1. Enter the setting mode, the screen flashes "0", enter "1-999" new ID, short press the [function/confirmation] key to save the exit. Note: If there is no special need, please do not modify! Do not set the keyboard ID to "000", otherwise it will cause the device can not be shut down. 2.2. [F2] Extension ID setting Enter the setting mode, the screen flashes "0", then remove the extension to be set from the top of the base, and immediately enter the new ID "1-999" from the keyboard within 3 seconds, then short press the [Function/Confirm] key to save and exit. 2.3. [F3] Prompt length setting Enter the setting mode, the screen flashes "0", then remove the extension to be set from the base (multiple extensions can be removed at the same time), and immediately enter the length "1-250" seconds from the keyboard and press the [Function/Confirmation] key (within 3 seconds) to save and exit. 2.4. [F4] beep switch setting Enter the setting mode, then the screen flashes "0", then take down the extension from the base to be set (You can take down more than one at the same time), and immediately enter the value from the keyboard ("0" is off, "1" is on) and then short press the [Function/Confirm] key (completed within 3 seconds) to save and exit.