1. Bubuka
The Cobra ACXT645 walkie talkies are designed for reliable two-way communication in various environments. This manual provides essential information for the proper use and maintenance of your device.
The ACXT645 features a splashproof (IPX4) rating, 22 channels with 121 privacy codes, NOAA Weather Alerts, Voice-Activated Transmission (VOX), VibrAlert feedback, and a built-in LED flashlight. These features enhance usability and safety during outdoor activities or in situations requiring dependable communication.

Image: Two Cobra ACXT645 walkie talkies, showcasing their design and display.
2. Eusi Paket
Pastikeun sadaya item aya dina pakét anjeun:
- 2 x Cobra ACXT645 Walkie Talkies
- 2 x Sabuk Klip
- 2 x Rechargeable AA NiMH Batteries
- 1 x Kabel Micro-USB
- 1 x Dual Dock Charger

Image: Contents of the Cobra ACXT645 package, including radios, charger, batteries, and belt clips.
3. Setélan
3.1. Masang Batré
- Remove the belt clip by releasing the belt clip latch and sliding the clip up.
- Tarik kana kancing panto batré pikeun nyabut panutup kompartemen batré.
- Insert the supplied three AA rechargeable NiMH batteries, observing polarity.
- Ganti panutup kompartemen batré sareng klip sabuk.
3.2. Ngecas Radio
The radios can be charged using the included dual dock charger or directly via the Micro-USB cable.
- Using the Dual Dock Charger: Place the walkie talkies into the charging slots on the dock. Ensure they are seated correctly. The charging indicator lights will illuminate.
- Using the Micro-USB Cable: Plug the Micro-USB cable into the USB charge jack located on the radio and connect the other end to a compatible USB power source.
It is recommended to charge the batteries fully before first use. The radio can be used while being charged.
3.3. Ngagantelkeun Klip Sabuk
Slide the belt clip onto the designated slot on the back of the radio until it clicks into place. This allows for convenient carrying on your belt, purse, or backpack.
4. Parentah Operasi
4.1. Daya Hurung / Pareum
Pencét jeung tahan tombol MODE / kakuatan button until the display illuminates to turn the radio on. To turn off, press and hold the same button until the display turns off.
4.2. Pamilihan Saluran
Ngagunakeun éta SALURAN UP or CHANNEL turun buttons to select one of the 22 available channels. The selected channel number will be displayed on the LCD screen.
4.3. Kodeu Privasi (CTCSS/DCS)
The ACXT645 supports 121 privacy codes (38 CTCSS and 83 DCS codes) to help reduce interference from other users. To set a privacy code:
- Pencét éta MODE / kakuatan button until the CTCSS or DCS icon flashes.
- Ngagunakeun éta SALURAN UP or CHANNEL turun tombol pikeun milih kodeu privasi nu dipikahoyong.
- Pencét éta MODE / kakuatan tombol pikeun ngonfirmasi tur kaluar.
Both radios must be set to the same channel and privacy code to communicate successfully.
4.4. Nepikeun jeung Narima
- Pikeun ngirimkeun: Pencét jeung tahan tombol Obrolan button. Speak clearly into the microphone. Release the Obrolan button to finish transmitting.
- Pikeun Nampi: The radio is always in receive mode when the Obrolan kancing henteu dipencet.
4.5. Volume adjustment
Ngagunakeun éta VOLUME UP or VOLUME TURUN buttons to adjust the listening volume. A double beep sound indicates the minimum and maximum volume levels.
4.6. Saluran Cuaca NOAA
The ACXT645 provides 24/7 access to NOAA weather channels. To activate:
- Pencét éta MODE / kakuatan button until the Weather icon appears.
- Ngagunakeun éta SALURAN UP or CHANNEL turun buttons to select a weather channel.
- Pencét éta MODE / kakuatan tombol pikeun ngonfirmasi tur kaluar.
4.7. Voice-Activated Transmission (VOX)
VOX allows for hands-free operation. When activated, the radio will automatically transmit when you speak. To enable/disable VOX:
- Pencét éta MODE / kakuatan button until the VOX icon flashes.
- Ngagunakeun éta SALURAN UP or CHANNEL turun buttons to select ON or OFF.
- Pencét éta MODE / kakuatan tombol pikeun ngonfirmasi tur kaluar.
4.8. VibrAlert®
This feature provides vibrating feedback for incoming transmissions, useful in noisy environments or when discretion is required. To enable/disable VibrAlert:
- Pencét éta MODE / kakuatan button until the VibrAlert icon flashes.
- Ngagunakeun éta SALURAN UP or CHANNEL turun buttons to select ON or OFF.
- Pencét éta MODE / kakuatan tombol pikeun ngonfirmasi tur kaluar.
4.9. LED Flashlight / SOS Function
The radio includes a built-in LED flashlight located at the bottom. To activate the flashlight, press the Lampu LED button. To activate the SOS function, press and hold the Lampu LED tombol pikeun sababaraha detik.
4.10. Fungsi Scan
The scan function allows you to automatically scan through all 22 channels and 121 privacy codes to find active transmissions. To activate, press the SCAN button. Press again to stop scanning.
4.11. Konci keypad
To prevent accidental changes to settings, you can lock the keypad. Press and hold the CALL/LOCK button for two seconds. The lock icon will appear on the display. Repeat the process to unlock.

Image: Key features of the Cobra ACXT645, including splashproof design, channels, and NOAA weather alerts.

Image: Additional features like VOX, VibrAlert, and the LED flashlight on the Cobra ACXT645.
Video: Produk ringkes réngséview of the Cobra ACXT645 walkie talkies, demonstrating their features and design.
5. Inpormasi Jarak Tempuh
The maximum range of up to 35 miles is achieved under optimal conditions, such as open water or rural areas with clear line of sight. Actual usable range can vary significantly due to several factors:
- rupa bumi: Dense foliage, hills, and urban structures can significantly reduce range.
- Cuaca: Adverse weather conditions can impact signal quality and range.
- Gangguan éléktromagnétik: Alat éléktronik atawa sinyal radio séjén bisa nyababkeun gangguan.
For communication over shorter distances or in areas with obstructions, the radio automatically switches to lower power to conserve battery life while still providing reliable communication.

Image: Explanation of walkie talkie range, detailing factors that affect usable range.
6. Pangropéa
6.1. beberesih
Bersihkeun bagian luar radio nganggo sabun anu lemes,amp cloth. Do not use abrasive cleaners or solvents, as these can damage the unit.
6.2. Kaperawatan batré
To maximize battery life, fully charge the batteries before each use. If storing the radios for an extended period, remove the batteries to prevent leakage.
6.3. Panyimpenan
Simpen radio di tempat anu tiis, garing, sareng jauh tina sinar panonpoé langsung sareng suhu anu ekstrim.
7. Cara ngungkulan
- Henteu aya kakuatan: Pastikeun batréna leres dipasang sareng dicas.
- Teu tiasa ngirim/nampi: Verify both radios are on the same channel and privacy code. Check if the keypad lock is active.
- Jangkauan/Gangguan Goréng: Adjust the Max Range Hi/Lo setting. Move to an area with fewer obstructions. Check for sources of electromagnetic interference.
- Static/Unclear Audio: Adjust volume. Ensure both radios are within effective range and have clear line of sight if possible.
8. Spésifikasi
| Fitur | Spésifikasi |
|---|---|
| Nomer modél | ACXT645 |
| Diménsi | 6.73 x 2.57 x 1.74 inci |
| Item Beurat | 5.1 ons |
| Jumlah Saluran | 22 |
| Kodeu Privasi | 121 (38 CTCSS, 83 DCS) |
| Rentang Frékuénsi | 400-512 MHz |
| Ngawangkong Range Maximum | 35 Miles (optimal conditions) |
| Tingkat Résistansi Cai | Tahan cipratan (IPX4) |
| Batré | 3 AAA NiMH rechargeable (included) |
| Fitur husus | NOAA Weather Alerts, VOX, VibrAlert, LED Flashlight, SOS Function |
9. Garansi jeung Rojongan
Cobra Electronics offers reliable communication solutions with over 50 years of proven quality. For any questions about operating or installing your new Cobra product, or to inquire about warranty service, please refer to the contact information provided in your product documentation or visit the official Cobra websitus.
This product is USA engineered and supported, exemplifying superior technology and craftsmanship.