The Perimeter Technologies PTC-PULSE canicom pulse bark control collar emits a warning beep followed by a harmless, yet effective, static correction whenever your dog barks. You can set the level with the potentiometer for your dog or let the collar take over and automatically determine the appropriate level.PTC-PULSE Features:# Pulse Bark Control Collar# For Dogs 15-200 lbs# 4 Operating Modes - Beep Only - Beep + Light Static Correction - Beep + Strong Static Correction - Beep + Automatically Adjusting Static Correction# On/Off Mode# Bark Detection By Contact Points# Bark Detection Sensitivity Adjustable By Potentiometer# Battery Level Indicator# 100% WaterproofSpecifications:# Weight: 3.1 oz.(Case + Battery)# Dimensions: 2.5" x 1.25" x 1.4"# Power: Rechargeable 3.6 Volt Ni-MH Battery# Adjustable Nylon Strap on Neck Sizes From 6.6" to 21"PTC-PULSE Includes:# 1 Collar Equipped w/ Short Contact Points & A Rechargeable Battery# 1 Battery Charger# 1 Magnetic Key (Magnet)# 1 Pair of Long Contact Points# 1 Screwdriver# 1 User's Guide