1. Introdução
This manual provides essential information for the safe and effective use of your DARKBEAM T25 Bike Tail Light. Please read these instructions thoroughly before operation and retain for future reference.
The DARKBEAM T25 is a compact, high-visibility bicycle taillight designed to enhance rider safety during night riding and low-light conditions. It features an LED display for battery status, multiple lighting modes, intelligent braking detection, and a durable, waterproof design.
2. Informações de segurança
- Always ensure the taillight is securely mounted and fully charged before each ride.
- Não olhe diretamente para o feixe de luz para evitar danos temporários à visão.
- Clean the light regularly to maintain optimal visibility. Use a soft, damp pano.
- Operating the bicycle taillight does not replace the need for other safety measures, such as wearing reflective clothing or using additional lighting.
- Adhere to all local traffic laws and regulations regarding bicycle lighting.
3. Conteúdo da embalagem
Verifique se todos os itens estão presentes no seu pacote:
- DARKBEAM T25 Bike Tail Light (battery included)
- Mount x 2 (1 Seat bow, 1 Seat tube)
- Tie strap (for fixing the seat bow) x 3
- Cabo de carregamento USB-C x 1
- Manual do usuário x 1
4. Produto acabadoview
The DARKBEAM T25 features a compact design with an integrated LED display and a single control button.

Figure 1: DARKBEAM T25 Bike Tail Light showing the LED display and USB-C port.
Principais características:
- Tela de LED: Shows real-time battery level.
- USB C recarregável: Carregamento prático e rápido.
- 6 modos de iluminação: Various options for visibility.
- IP55 à prova d'água: Projetado para uso em diversas condições climáticas.
- Intelligent Braking: Automatically increases brightness upon deceleration.
- Suspender/ativar automaticamente: Conserves battery by entering sleep mode after 30 seconds of inactivity and waking upon vibration.
5. Configuração e instalação
The DARKBEAM T25 offers versatile mounting options to suit your bicycle setup.

Figure 2: Two primary mounting styles: saddle rail and seat post.
5.1. Montagem do Canote do Selim
- Select the appropriate position on your seat post.
- Wrap the silicone strap of the seat post mount around the seat post.
- Hook the strap securely into one of the slots on the mount.
- Insert the taillight into the mount at a 45-degree angle and rotate it 45 degrees to the left or right until it clicks into place.
5.2. Montagem do trilho do selim
- Secure the saddle rail mount to the saddle rails using the provided zip ties. Ensure it is tight and stable.
- Insert the taillight into the mount at a 45-degree angle and rotate it 45 degrees to the left or right until it clicks into place.
Video 1: Demonstration of DARKBEAM Bike Tail Light installation and features.
6. Instruções de operação
6.1. Ligar/desligar
- To turn on: Press and hold the power button (located on the side) for approximately 2 seconds.
- Para desligar: Pressione e mantenha pressionado o botão liga/desliga por aproximadamente 2 segundos.
6.2. Alterando os modos de iluminação
Once the light is on, short press the power button to cycle through the 6 available lighting modes:
- Stay On (Constant Light Mode)
- Rapid Flash Mode
- Breathing Flash Mode
- Modo de flash
- Modo de cintilação
- Single Flash Mode
The light features a mode memory function, meaning it will restart in the last used mode when turned on again.

Figure 3: Visual representation of the 6 available lighting modes.
6.3. Intelligent Braking and Sleep Function
- Detecção de freio: In normal mode, the taillight automatically detects rapid deceleration (braking) and increases its brightness to alert vehicles behind you.
- Suspensão automática: If the taillight remains stationary for 30 seconds after being turned on, it will enter a sleep mode to conserve battery.
- Despertar automático: The light will automatically wake up from sleep mode upon detecting vibration (movement).

Figure 4: Brake sensor in action, increasing brightness when deceleration is detected.
6.4. Instruções de carregamento
The DARKBEAM T25 is equipped with a USB-C charging port.
- Locate the USB-C port on the side of the taillight, protected by a waterproof cover.
- Gently open the waterproof cover.
- Connect the provided USB-C cable to the taillight and the other end to any standard USB power source (e.g., power bank, laptop, USB adapter). Ensure the power supply voltage does not exceed 5V 2A.
- O visor LED indicará o estado do carregamento.
- O tempo de carregamento é de aproximadamente 2.5 horas.
- Once fully charged, disconnect the cable and securely close the waterproof cover to maintain IP55 water resistance.

Figure 5: USB-C fast charging with various compatible devices.
7. Manutenção
7.1. Limpeza
To clean the taillight, wipe it with a soft, damp pano. Não utilize produtos de limpeza abrasivos ou solventes, pois estes podem danificar o dispositivo.
7.2. Armazenamento
When not in use for extended periods, store the taillight in a cool, dry place. It is recommended to charge the battery every 3-6 months to prolong its lifespan.
7.3. Resistência à água
The DARKBEAM T25 has an IP55 water resistance rating, meaning it is protected against dust ingress and low-pressure water jets from any direction. Ensure the USB-C port cover is always securely closed to maintain water resistance.

Figure 6: The taillight is designed to withstand rain and splashes.
8. Solução De Problemas
- Luz não acende: Certifique-se de que a bateria esteja carregada. Pressione e segure o botão liga/desliga por 2 segundos.
- Luz não carrega: Verifique o cabo USB-C e a conexão da fonte de alimentação. Certifique-se de que a porta de carregamento esteja limpa e livre de detritos.
- Light not responding to movement (Auto Wake): Ensure the light is not in sleep mode. If it is, simply move the bike to activate it.
- Light falling off mount: Re-check installation steps to ensure the mount is securely fastened and the light is properly clicked into the mount.
9. Especificações
| Recurso | Especificação |
|---|---|
| Nome do modelo | T25 |
| Marca | RAIO ESCURO |
| Material | Plástico |
| Peso do item | 24 gramas |
| Dimensões do item (CxLxA) | 1.26 x 1.18 x 1.26 polegadas |
| Fonte de energia | Alimentado por bateria (recarregável via USB-C) |
| Brilho | 500 lúmens (máx.) |
| Número de configurações | 6 modos de luz |
| Nível de resistência à água | IP55 à prova d'água |
10. Garantia e Suporte
The DARKBEAM T25 Bike Tail Light comes with a standard manufacturer's warranty against defects in materials and workmanship. For warranty claims, technical support, or any questions regarding your product, please contact DARKBEAM customer service through the retailer where the product was purchased.





