GIYO Smart Bicycle Rear Light with Brake Sensing, Six Modes, USB Rechargeable 350mAh Battery and Dual Seatpost or Saddle Rail Mounts

Compact rechargeable bicycle rear light

This GIYO square rear light combines a red lens, a central control button and an aluminum-alloy and ABS body. The compact body measures approximately 31mm high by 31mm wide and 28mm deep, with an approximate 26g product weight. It suits bicycles using a compatible seatpost or saddle-rail mounting position.

Deceleration sensing and automatic operation

The built-in sensor detects deceleration and activates a brighter brake-light signal for approximately 3 seconds. In automatic operation, movement can wake the lamp in dim surroundings, while approximately 45 seconds without movement allows it to sleep. The source also describes mounting-angle compensation for different seatpost angles. Check the chosen operating mode and light operation before each ride.

Manual and automatic modes

Quickly double-press the central button while the light is operating to switch between manual and automatic modes. The green button outline identifies automatic operation and the red outline identifies manual operation. Automatic motion and ambient-light functions depend on the selected mode and surrounding light conditions.

Six light patterns with rated runtimes

Choose Steady, Breathing, Slow Flash, Fast Flash, Interval Flash or ECO Flash. Listed runtimes are approximately 10,12,18,18,18 and 35 hours respectively. These are supplier-rated values rather than guaranteed endurance: selected mode, battery condition, use of brake sensing and charging conditions affect actual runtime.

USB charging and battery-level indication

The internal 350mAh battery charges through the included USB cable. Product information lists a 5V 280mA charging input and approximately 2 hours 20 minutes charging time. The charging indicator is red while charging and green when fully charged. When powered on from off in manual mode, the battery indicator displays for about 2 seconds: green above 80%, blue from 30% to 80%, and red below 30%.

Seatpost and saddle-rail mounting choices

The kit includes a flexible seatpost strap bracket and a separate saddle-rail bracket secured with cable ties. Choose the position that fits the bicycle and keeps the light visible, clear of moving parts and firmly retained. The fitting photographs show both mounting arrangements; the bicycle and saddle are demonstration items.

Lens and weather rating

The source describes 16 LED beads behind a Fresnel lens to distribute the rear light. The stated IPX 4 rating covers splash resistance for riding conditions. Close the charging-port cover securely after charging and care for the light according to the included instructions.

Included kit and setup

One GIYO rear light is supplied with the pictured USB cable, seatpost strap bracket, saddle-rail bracket, cable ties, small pads and instruction leaflet. Select the preferred light pattern, confirm the battery indication and check that the mount stays secure before riding.