1、Made of high quality nylon, soild and durable. With the luminous LED light, shine at night 2、Adjustable length, easy and comfortable to wear 3、Easy to operate, switch button for gear adjustment, press once, quickly flash. Press twice, slowly flash. Press three times for constant light. Press four times, light off 4、Convenient to charge, with the reusable USB cable, it can be charged by phone charger, laptop, PC, etc. No waste of battery, more environmentally friendly 5、Luminous collar prevent from pet lost, ensure dog's safety when walk outside at night Features: 1. Made of high quality nylon, soild and durable. With the luminous LED light, shine at night. 2. Adjustable length, easy and comfortable to wear.  3. Easy to operate, switch button for gear adjustment, press once, quickly flash. Press twice, slowly flash. Press three times for constant light. Press four times, light off.  4. Convenient to charge, with the reusable USB cable, it can be charged by phone charger, laptop, PC, etc. No waste of battery, more environmentally friendly.  5. Luminous collar prevent from pet lost, ensure dog's safety when walk outside at night.  Specification: Condition:100% Brand New Material: Nylon Color: Red, Blue, Pink(optional) Charging Time: 30 mintues full, can be used for over ten hours.  Size: S, M, L(optional) S , Telescopic range: 28cm-40cm/11in~ 15.8in M, Telescopic range: 33cm-50cm/13in~ 19.7in L,  Telescopic range: 38cm-60cm/15in~ 23.6in Weight: Approx.62g~72g/ 2.2oz~ 2.5oz Package list:  1 * LED Collar  1 * USB Cable Note: 1. Please allow 0~1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.