Product parameters: Model Number: HT-30 Fiber type: Single mode Center wavelength: 650nm10nm Transmitter Type: LD Output power: 5mW Output distance: 5-30KM Optical connector: 2.5mm universal connector Continuous wave frequency: 2Hz Power: 2 AA alkaline batteries (battery not included with product) Working temperature: -10~+60 Storage temperature: -20~+70 Size: 175 * 26 * 26MM Quantity: 1 Reminder: The ceramic core is fragile and cannot be installed and operated by force. Package Included: 1 visual fault locator Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!