E-21 Receiver*1 Outputs voice sound.2 Indicator 1 Orange: ChargingGreen: Charging completeRed: Battery pack error or the surrounding temperature is out ofthe charging temperature range.3 Indicator 2 Flashes blue when operating via Bluetooth or orange whenoperating via W-LAN, GPS or W-WAN. Lights red when thereis a bar code scanning error and lights green when a bar codescans successfully.Lights red when the alarm function is activated.4 Screen The screen displays texts, operations, indicators and so forth. Inaddition, operations can be performed and data can be input onthe screen using stylus.5 Center Trigger Key Used to perform bar code reading. Can be assigned an arbitraryfunction.6 Function Keys Used when starting a pre-registered application.7 Power Key Turns the power on and off.8 Enter Key Press when finishing entering numerical values or when movingto the next step.9 Mode Key The key switches the character input mode, either characters inlowercase letter or characters in uppercase letter.10 Fn Key Used to make various settings in combination with the functionkeys or numeric keys or when starting a pre-registeredapplication.11 CLR Key Used to clear one letter to the left of the cursor.12 Microphone*1 Used for audio input (including voice).13 Speaker Generates audio and buzzer tones.14 Numeric Keys Used to enter numeric values and decimal points.15 Cursor Key Perform the same functions as the up and down arrow keys on aPC keyboard.16 Barcode Reader Laser light or LED light is emitted from this window that readsbar codes.17 NFC Reader *2 Holding a contactless IC card up to this reader allows data to beread from and written to the card.18 microUSB Port For connecting to microUSB cable (HA-N81USBC).19 Headset Jack Used to connect an earphone-microphone headset.20 L Trigger Key Used to perform bar code reading.21 microSD Card Slot microSD card slot.22 R Trigger Key Used to perform bar code reading.23 Camera Lens *2 Takes photos.