1. Compact Blue Streetwise Mini S.M.A.C.K. (Stun My Attacker Compact Keychain) 20,000,000 Volt Stun Gun (Click Link to Check Price on Amazon)
Editor's Rating : 9.3 out of 10
Streetwise Mini SMACK 20,000,000* Stun Gun

2. Streetwise Security Products SMKM20BK Mini SMACK 20 Million Volt Stun Gun (Click Link to Check Price on Amazon)
Editor's Rating : 9.1 out of 10
World's Smallest Keychain Stun Gun: Although the Mini S.M.A.C.K. is less than half the size of a normal stun gun, it has more power than most models on the market todayUnique "Slide and Stun" Switch: Standard stun guns use a button on the side to active the stun gun. This model features a unique slide switch

3. World's Smallest Guard Dog Hornet Keychain Stun Gun with LED Flashlight 6,000,000 Volts (Click Link to Check Price on Amazon)
Editor's Rating : 9.6 out of 10
Powerful, loud 6,000,000 stun gun with intimidating sparkBuilt-in 3 LED flashlight

4. VIPERTEK VTS-881 - 38,000,000 V Micro Stun Gun - Rechargeable with LED Flashlight, Black (Click Link to Check Price on Amazon)
Editor's Rating : 8.8 out of 10
Powerful Micro Stun Gun With LED Flashlight - The power of a full size stun gun at HALF the size!Micro Size, Conceals Easily - Only 3-3/4" tall, 1 1/2" wide and 3/4" thick - Slips easily into a pocket or purse.

5. Stuns R Us # 1 Key Chain and Stun Gun Rechargeable 20 Million Volts LED Flashlight Perfect Stuns R Us (Click Link to Check Price on Amazon)
Editor's Rating : 9.1 out of 10
World's Smallest Keychain Stun Gun: Although the Mini S.M.A.C.K. is less than half the size of a normal stun gun, it has more power than most models on the market today. Just test firing this unit into the air is often enough to stop an attacker.Unique "Slide and Stun" Switch: Standard stun guns use a button on the side to active the stun gun. This model features a unique slide switch.