Specification: Product shell material: ABS (Optional)Color: Red / Blue / Yellow / Green Product size: Approx. 8.5 * 1.7CM * thickness 1.7CM (including buckle) Product battery: 2 CR1220 button batteries (included) Life time: 20-30 hours Product light color: Red / Blue / Yellow / Green Lighting mode: always on, flashing, off Suitable for pet type: full breed Product function: to ensure the safety of walking dogs at night, wearing luminous pendants, so that pets are more eye-catching at night, to prevent lost. Package list: 1 * Pet Luminous Pendant Note: 1. Please allow slight error due to manual measurement. 2. Different monitor colors may be different. Thanks for your kind understanding.