The Rooster Farms Citronella Bark Collar is designed as a training aid to help manage excessive barking. It uses a combination of sound detection and citronella spray to interrupt barking behaviour. Suitable for indoor and outdoor use. Note: Training aid only. Not suitable for puppies under 6 months. Do not use for extended continuous periods. Wipe clean only. Features: Citronella Spray Function: Releases a short burst of citronella based spray when barking is detected. Sound Activated Sensor: Designed to respond to barking sound and activate the spray function. Rechargeable Design: Built in rechargeable lithium battery with USB charging. Adjustable Fit: Strap adjusts to suit a range of dog sizes. Refillable Cartridge: Compatible with replaceable citronella spray refills. Specifications: Weight: 73g Max Neck Size: 60cm Refill Size: 85g Battery: 3.7V rechargeable lithium battery Charging: USB Material: ABS and nylon Mode: Sound activated Package Includes: 1 x Bark Collar 1 x Adjustable Strap 1 x USB Cable 1 x Citronella Refill 1 x Manual No standalone lithium batteries are sold with the product.