The Garmin PT10 Add-On Electronic Dog Training Collar is designed for versatility and reliability. It's perfect for adding more dog devices to your pack, allowing you to train up to 6 dogs on one PRO 70 handheld or 3 dogs on one PRO 550 handheld. With a range of 1 mile, this collar provides ample space for training and hunting. The built-in BarkLimiter features Autorise technology, which automatically adjusts correction to the optimum level needed to stop unwanted barking. This collar is also equipped with remote-operated LED beacon lights for low light conditions. Fast shipping ensures you can get started quickly. The PT10's rechargeable lithium-ion battery provides up to 60 hours of use.Product Features and Specifications: Dimensions: 3.1" x 1.7" x 1.7" Weight: 3.5 oz Battery: Rechargeable lithium-ion (included) Battery life: 60 hours Floats: No Beacon lights: Yes Vibration: PRO 550 only Accessory unit activation: PRO 550 only BarkLimiter mode: Yes Tone: Yes